Sperm head. Medical search. Frequent questions

Sperm motility and hence male fertility strictly depends on proper development of the sperm tail and its tight anchorage to the head. (nih.gov)
However, the impact of ODF1 on sperm tail formation and motility and on male fecundity is unknown. (nih.gov)
Heterozygous mutant male mice are fertile while sperm motility is reduced, but Odf1-deficient male mice are infertile due to the detachment of the sperm head. (nih.gov)
In addition, since sperm motility is already affected in heterozygous mice, impairment of ODF1 might even account for some cases of reduced fertility in male patients. (nih.gov)
Heavy smokers have also been shown to have lower sperm motility, another way of saying the ability of sperm to travel through the female reproductive tract in search of an egg to fertilize. (dailymail.co.uk)
In aquatic habitats, gametes are released into the water where sperm acquire motility and navigate to the egg. (elifesciences.org)
Of course, that might not be such bad advice, but why it might be reasonable advice has absolutely nothing to do with sperm counts, sperm motility, or infertility. (scienceblogs.com)
Structural events and molecular mechanisms that promote mammalian sperm acrosomal exocytosis and motility. (uba.ar)
Moreover, the distinction between living round spermatids, to be used in ROSI, and dead round spermatids, to be discarded, needs specific methods and skills, not required in the case of ICSI where sperm cell viability can be easily evaluated on the basis of sperm motility in most cases. (wikipedia.org)

Taken together, the severe impact of SUN4 deficiency on the nucleocytoplasmic junction during sperm development provided direct evidence for a crucial role of SUN4 and other LINC complex components in mammalian sperm head formation and fertility. (uni-wuerzburg.de)
To learn more about the epigenetic-offspring connection, his lab is now collaborating with a fertility clinic to study epigenetic differences in discarded embryos generated from the sperm of men with various degrees of body weight. (sciencedaily.com)
Men with undescended testicles can have impaired sperm product and fertility, according to the researchers. (livescience.com)
A man's sperm count does not always correspond to his fertility, Kramer said. (livescience.com)
The research suggests that sperm counts (the number of sperm produced, as opposed to their fertility) have reduced by more than 50% in western men in the last 40 years. (thejournal.ie)
Fertility experts are warning man that using a mobile for as little as an hour a day is "cooking sperm" and lowering level significantly. (scienceblogs.com)
The University of Utah, which is probing the incidence of possible sperm swap at fertility clinic in a Salt Lake City area, has termed the action of fertility clinic worker as unacceptable. (utahpeoplespost.com)
Understand how lifestyle factors can affect your sperm and what you can do to improve your fertility. (mayoclinic.org)
Know what can affect male fertility - then consider steps to help the sperm achieve the goal. (mayoclinic.org)
Fertility is most likely if the semen discharged in a single ejaculation (ejaculate) contains at least 15 million sperm per milliliter. (mayoclinic.org)
The ability of sperm to move and the number of typical sperm tend to decrease with age, affecting fertility, especially after age 50. (mayoclinic.org)
While men have hormonal or autoimmune abnormalities that hamper sperm production or destroy sperm, factors like stress, drinking and obesity can also interfere with fertility. (asianage.com)
In many types of fertility treatments, donor sperms are used. (drmalpani.com)
More studies of fertility outcomes in large populations are required to refine the application of CASA to measuring sperm morphology. (myhealth.gov.my)
Men who are going to get radiation or chemotherapy may store their sperm before treatment, because these treatments may cause fertility problems. (msdmanuals.com)

By its morphology alone, the sperm whale hence appears like an all-round champion of cetaceans. (oregonstate.edu)
The morphology of sperm cells is the end result of a highly complex process of cellular modifications occurring during spermiogenesis. (myhealth.gov.my)
However, the focus of this article is going to be on the assessment of image analysis to indicate the normal sperm morphology of an ejaculate. (myhealth.gov.my)
Sperm morphology was assessed in the initial semen analysis using the Kruger-Tygerberg Strict Criteria as outlined by the World Health Organization. (myhealth.gov.my)
It can be used in teratozoospermia , because once the egg is fertilized, abnormal sperm morphology does not appear to influence blastocyst development or blastocyst morphology. (wikipedia.org)
[6] Even with severe teratozoospermia, microscopy can still detect the few sperm cells that have a "normal" morphology, allowing for optimal success rate. (wikipedia.org)
ICSI procedure: the oocytes will be placed into the standard ICSI petri dish and they will be injected with sperm with normal morphology. (who.int)

NHE11) Is a Testis-Specific Protein Localized to the Head of Mature Mammalian Sperm. (bvsalud.org)

Sperm whales in the 19th century taught each other how to attack whalers by ramming the boats with their head, scientists have found. (newsweek.com)
However, a particular group of whalers sailing in the North Pacific in the 1820s began having trouble with sperm whales, according to Whitehead, as their harpoons were not taking down the whales as effectively. (newsweek.com)
To protect themselves against predators, such as killer whales, sperm whales usually cluster together in a large group, forming a tight circle of defense. (newsweek.com)
Sperm whales communicate to each other through "clicking" sounds and patterns, Whitehead said. (newsweek.com)
The sperm whales can hear each other and they can probably identify each other from their sounds too. (newsweek.com)
Sperm whaling is the human practice of hunting sperm whales, the largest toothed whale and the deepest-diving marine mammal species, for the oil, meat and bone that can be extracted from the cetaceans' bodies. (wikipedia.org)
Sperm whales are prized for the sperm oil, a waxy secretion that was especially popular as a lubricant and illuminant during the Industrial Revolution, and so they were heavily targeted in 19th-century commercial whaling, as exemplified in Moby Dick. (wikipedia.org)
Sperm whales were hunted in the 19th century by American, British and other national whaling fleets. (wikipedia.org)
Although spermaceti by-products were high-value, they made up only a small proportion, perhaps 10%, of the substances extracted from sperm whales. (wikipedia.org)
Prior to the early 18th century, sperm whales were hunted in Japan and Indonesia. (wikipedia.org)
Legend has it that sometime in the early 18th century, supposed to be not far from 1712, Captain Christopher Hussey, while cruising for right whales near shore, was blown offshore by a northerly wind, where he encountered a school of sperm whales and killed one. (wikipedia.org)
Although the story may not be true, sperm whales were indeed soon exploited by American whalemen, as Judge Paul Dudley, in his Essay upon the Natural History of Whales (1725), states that one Atkins, ten or twelve years in the trade, was among the first to catch sperm whales sometime around 1720. (wikipedia.org)
Only a few sperm whales were recorded to have been caught during the first few decades (1709-1730s) of offshore whaling, as sloops concentrated on Nantucket Shoals where they would have taken right whales or were sent to the Davis Strait region to catch bowhead whales. (wikipedia.org)
By the early 1740s, with the advent of spermaceti candles (before 1743), American vessels appear to have begun to take sperm whales in earnest. (wikipedia.org)
The diary of Benjamin Bangs (1721-1769) shows that, along with the bumpkin sloop he was in, he found three other sloops with sperm whales being flensed alongside off the coast of North Carolina in late May 1743. (wikipedia.org)
The Caribbean island of Dominica is creating the world's first marine protected area for sperm whales, the island's government announced Monday. (yahoo.com)
Sperm whales are listed as endangered under the Endangered Species Act and as depleted under the Marine Mammal Protection Act. (yahoo.com)
By protecting sperm whales, Dominica is bolstering its climate resilience. (yahoo.com)
The more sperm whales in Dominica's waters, the more carbon sequestered in the deep sea, thus helping to mitigate global warming. (yahoo.com)
The 200 or so sperm whales that call our sea home are prized citizens of Dominica,' Dominica's Prime Minister Roosevelt Skerrit said in a statement. (yahoo.com)
All of this comes together to paint a distressing picture for the future of sperm whales. (yahoo.com)
They would like not to be called sperm whales, if you please. (funtrivia.com)
Sperm whales defecate near the surface because they shut down non-vital functions when they dive to depths of up to 10,000 feet (3,000 meters). (fox4kc.com)
And sperm whales in Dominica are believed to defecate more than whales elsewhere, said Shane Gero, a whale biologist and founder of the Dominica Sperm Whale Project, a research program focused on sperm whales in the eastern Caribbean. (fox4kc.com)
It's unclear why sperm whales seem to defecate more in Dominica. (fox4kc.com)
In some respects, sperm whales are fighting climate change on our behalf," Gero said in an interview. (fox4kc.com)
Less than 500 sperm whales are estimated to live in the waters surrounding Dominica, part of a population that moves along the Lesser Antilles chain, swimming as far south as St. Vincent and north into Guadeloupe. (fox4kc.com)
Unlike sperm whales elsewhere in the world, the ones around the eastern Caribbean don't travel very far, Gero said. (fox4kc.com)
He noted that sperm whales are a matrilineal society, with young males leaving and switching oceans at some point in their lives. (fox4kc.com)
Sperm whales can produce a single calf every five to seven years. (fox4kc.com)
In waters around Dominica and elsewhere, sperm whales have been hit by ships, entangled in fishing gear and affected by agricultural runoff, limiting their survival. (fox4kc.com)
In the pre-whaling days, an estimated 2 million sperm whales roamed the Earth's deep waters before they were hunted for oil used to burn lamps and lubricate machinery. (fox4kc.com)
The government of Dominica said the reserve will allow sustainable artisanal fishing and delineate an international shipping lane to avoid more deaths of sperm whales, which have the largest brain in the world and can grow up to 50 feet (15 meters). (fox4kc.com)
Visitors can still swim with sperm whales and see them from a boat, but in limited numbers. (fox4kc.com)
The government of Dominica has realized that the sperm whales, which were probably here before humans, are also citizens of Dominica," he said. (fox4kc.com)
Having worked almost exclusively on humpback whales for the past 5 years, I recently realized how specialized I have become when I was asked to participate in an expedition targeting another legendary cetacean, which I discovered I knew so little about: the sperm whale. (oregonstate.edu)
The expedition was named " Code CODA " in reference to the unique patterned series of clicks produced by sperm whales. (oregonstate.edu)
As I prepared for the expedition, I did my scientific literature homework and felt a growing awe for sperm whales. (oregonstate.edu)
Below is a list summarizing five mind-blowing facts everyone should know about sperm whales. (oregonstate.edu)
Sperm whales are the largest of the odontocetes species, which is the group of "toothed whales" that also includes dolphins, porpoises and beaked whales. (oregonstate.edu)
Indeed, male sperm whales can reach up to 18 m and 56 tons (approximately the weight of 9 elephants! (oregonstate.edu)
Sperm whales are some of the best divers among air-breathing sea creatures. (oregonstate.edu)
In these dark and cold waters, sperm whales hunt for fish and squids (and sometimes check out ROVs, see videos of a surprising deep sea encounter made in 2015 off the coast of Louisiana, on Nautilus Live ). (oregonstate.edu)
The squid sucker scars born by sperm whales give evidence of these titan combats. (oregonstate.edu)
Because sperm whales only have teeth on the lower jaw, they cannot chew and may end up eating their prey alive. (oregonstate.edu)
But every problem has its solution… sperm whales have evolved the longest digestive system in the world: it can reach 300 m long! (oregonstate.edu)
Sperm whales are highly social animals. (oregonstate.edu)

The rats exposed to e-cigarette vapor had lower sperm counts, measuring 95.1 million sperm per milliliter for the e-cigarette group compared to 98.5 million per milliliter for the control group. (dailymail.co.uk)
The causes of low sperm counts - considered to be anything under 15 million sperm per milliliter of semen - are complex and include both genetic and lifestyle factors. (asianage.com)

Biallelic mutations in Sperm flagellum 2 cause human multiple morphological abnormalities of the sperm flagella (MMAF) phenotype. (nih.gov)
Loss-of-function mutations in SPEF2 cause multiple morphological abnormalities of the sperm flagella (MMAF). (nih.gov)
Homozygous mutations in SPEF2 induce multiple morphological abnormalities of the sperm flagella and male infertility. (nih.gov)
In the case of environmental toxins, Michael Skinner's reproductive biology lab at Washington State University Pullman in the United States first reported in 2005 that injecting pregnant rats with endocrine disruptor fungicide vinclozolin caused sperm abnormalities that persisted in the male progeny for at least 4 generations [4]. (i-sis.org.uk)
In humans, it leads to widely heterogenous morphological pattern, with many cellular abnormalities which may be associated with sperm dysfunction. (myhealth.gov.my)
The morphological assessment of human spermatozoa which includes the evaluation of the percentage of morphologically normal sperm and the determination of the incidence of various morphological abnormalities has always been part if semen analysis in couples consulting for infertility. (myhealth.gov.my)

A stock photo shows a pod of sperm whale. (newsweek.com)
The sperm whale, being a toothed hunter, lacked this so-called whalebone, but it did produce a valuable commodity: sperm oil. (wikipedia.org)
One was a very pure type of sperm whale oil that required little or no additional processing. (wikipedia.org)
Two other products of the sperm whale are of economic importance. (wikipedia.org)
Historically, whaling took a heavy toll on sperm whale populations. (wikipedia.org)
The sperm whale population has been declining for the last 20 years, Sala previously told 60 Minutes. (yahoo.com)
National Geographic Explorer Shane Gero started the Dominica Sperm Whale Project. (yahoo.com)
2. How did cachalots come to be known by the unflattering name of sperm whale? (funtrivia.com)
Early whalers believed this was a massive sperm reservoir so the substance was dubbed spermaceti, and the name sperm whale naturally followed. (funtrivia.com)
The tiny island of Dominica announced on Nov. 13, 2023 that it is creating the world's first marine protected area for one of earth's largest animals: the endangered sperm whale. (fox4kc.com)
SAN JUAN, Puerto Rico (AP) - The tiny Caribbean island of Dominica is creating the world's first marine protected area for one of earth's largest animals: the endangered sperm whale. (fox4kc.com)
They have been recorded down to 2,250 m, and sperm whale carcasses have been found entangled in deep-sea cables suggesting that they can dive even deeper. (oregonstate.edu)
The digestion of sperm whale prey happens in the next digestive compartments, but one component will resist: the squids' beaks! (oregonstate.edu)

In addition to measuring sperm count, testes weight and size, and sperm mobility, the researchers looked at the structure of the testes in each group under a microscope to assess any changes to the health of cells in the testes. (dailymail.co.uk)

The main protein of sperm tail outer dense fibers, ODF1/HSPB10, belongs to the family of small heat shock proteins that function as molecular chaperones. (nih.gov)
Our results thus suggest that ODF1, besides being involved in the correct arrangement of mitochondrial sheath and outer dense fibers, is essential for rigid junction of sperm head and tail. (nih.gov)
This channel is activated by signalling molecules inside cells, called 'cyclic nucleotides', and its activity ultimately leads to calcium ions flowing into the sperm cell's tail. (elifesciences.org)
This influx of calcium ions in turn controls the beating of the tail and, thereby, steers the sperm cell towards the egg. (elifesciences.org)
For instance, in fruit flies, the sperm is almost all "tail," whereas ostracod sperm is all "head" and moves by rotating its body in a screw-like way. (mongabay.com)
We could say that the head of the sperm serves as a reservoir of the male's DNA and transport of thhis DNA is acheived thanks to the movement of the sperm's tail. (invitra.com)
The drag between the head of the sperm and the wall slows the sperm down and swings its tail downstream. (sciencenews.org)
Additionally, instead of having one tail (flagellum) per sperm cell, affected sperm have multiple flagella, most often four. (medlineplus.gov)
Located on the posterior border of the testis, it is composed of 3 parts, including the head (caput), body (corpora), and tail (cauda). (medscape.com)

Mice deficient for SUN4 exhibited severely disorganized manchette residues and gravely misshapen sperm heads. (uni-wuerzburg.de)
Unhealthy, diseased and misshapen sperms are unlikely to fertilize an egg and should not be considered for fertilization. (drmalpani.com)
In affected males, almost all sperm cells have abnormally large and misshapen heads. (medlineplus.gov)

It is characterized by abnormal sperm and leads to an inability to father biological children (infertility). (medlineplus.gov)
Because of the additional genetic material, if one of these abnormal sperm cells combines with an egg cell, the embryo will not develop or the pregnancy will result in miscarriage. (medlineplus.gov)

The findings make sense, said Dr. Andrew Kramer, a urologist at the University of Maryland Medical Center, because higher temperatures are known to affect sperm production. (livescience.com)
Exposure to pesticides, lead and other toxins can affect sperm quantity and quality. (mayoclinic.org)

Isolated teratozoospermia does not affect in vitro fertilization outcome and is not an indication for intracytoplasmic sperm injection. (myhealth.gov.my)
Intracytoplasmic sperm injection ( ICSI / ˈ ɪ k s i / IK -see ) is an in vitro fertilization (IVF) procedure in which a single sperm cell is injected directly into the cytoplasm of an egg . (wikipedia.org)
Schematic image of intracytoplasmic sperm injection in the context of IVF . (wikipedia.org)

A scientist picks up a vial of frozen donor sperm samples. (yahoo.com)
The donor is being sued in a bid to prevent him from continuing to donate sperm. (yahoo.com)
A Dutch sperm donor who is accused of fathering 550 children is facing legal action aimed at stopping him from continuing to donate, over fears his prolific giving could increase the risk of accidental incest. (yahoo.com)
The Dutch News, which described Meijer as an "obsessive" sperm donor, said the Dutch gynecologists' society, NVOG, first issued a warning about Meijer in 2017. (yahoo.com)
On very rare occasions when the donor did not show and no frozen specimen was available, I used my own sperm," Yussman said. (whas11.com)
There is a nine-month wait for donor sperm. (bioedge.org)
Sperm from a donor can only be used by 5 married women (no singles), even though other countries allow 10. (bioedge.org)
Some men, who have had irreversible vasectomies, may also consider using a sperm donor for reproduction. (drmalpani.com)
After the woman's eggs are retrieved for IVF, they will be fertilized with the washed and treated donor sperms. (drmalpani.com)
In case you have opted for an IUI , the donor sperms are placed near your cervix or inside the uterus using a thin catheter for in utero fertilization. (drmalpani.com)
Sperm donation has helped make thousands of pregnancies possible, but do you need donor sperm and if so how is donor sperm used in your treatment? (drmalpani.com)

They measured how much sperm the animals could make, what their testicles looked like under a microscope and markers of stress in the blood and genitals. (dailymail.co.uk)
They measured changes in sperm count, as well as the size of their testicles, using a measurement known as the Gonadosomatic index (GSI). (dailymail.co.uk)
The new study shows that having a mobile phone close to the testicles - or within a foot or two of the body - can lower sperm levels so much that conceiving could be difficult. (scienceblogs.com)
Testicles produce sperm. (mayoclinic.org)
This condition is called non-obstructive or secretory azoospermia, as opposed to obstructive azoospermia, in which complete sperm production does occur in the testicles, and potentially fertilizing spermatozoa can be obtained by testicular sperm extraction (TESE) and used for ICSI. (wikipedia.org)
The testicles are the pair of organs where sperm is made. (msdmanuals.com)

Between 1973 and 2011, the concentration of sperm for men in developed countries has fallen by an average of 1.4% per year, 52% in total. (thejournal.ie)
Men who were highly exposed to the compounds, such as those who worked in farming, had significantly less sperm concentration than men with less exposure. (witn.com)
Infertility in men can result from deficiencies in sperm formation, concentration, or transportation. (medscape.com)

In his study, Barrès and colleagues compared specific epigenetic marks in the ejaculate of lean and obese men (men were the focus because sperm is much easier to obtain than eggs). (sciencedaily.com)
Pregnancy is possible with less than 40% of the sperm in ejaculate moving, but 40% is considered the threshold. (mayoclinic.org)
Mean sperm counts per ejaculate and percentage of viable sperm were significantly lower in the exposed workers. (cdc.gov)

Loss of function of ODF1, therefore, might account for some of the cases of human infertility with decapitated sperm heads. (nih.gov)
But regular cigarettes - which have long been tied to male infertility - were even worse in terms of lowering sperm count and disrupting sexual function. (dailymail.co.uk)
This procedure is most commonly used to overcome male infertility problems, although it may also be used where eggs cannot easily be penetrated by sperm, and occasionally in addition to sperm donation . (wikipedia.org)
Homozygous mutation of AURKC yields large-headed polyploid spermatozoa and causes male infertility. (medlineplus.gov)
Indications for performing a postcoital test include semen hyperviscosity, increased or decreased semen volume with good sperm density, or unexplained infertility. (medscape.com)
Testicular biopsy is indicated in azoospermic men with a normal-sized testis and normal findings on hormonal studies to evaluate for ductal obstruction, to further evaluate idiopathic infertility, and to retrieve sperm. (medscape.com)

Unfortunately for the image of sperm donation, that is what allegedly happened to a 35-year-old man, Zheng Gang, in the central city of Wuhan who died soon after donating sperm at a clinic run by a local university. (bioedge.org)
Furthermore, apart from moral considerations, sperm donation is regarded as squandering one's virility and tarnishing the family line. (bioedge.org)
However, on paper, sperm donation in China is strictly regulated. (bioedge.org)
Sperm donation is on the rise, and many healthy men donate their sperm for women who want to have babies but do not have access to fertile sperms. (drmalpani.com)
When Should You Consider Sperm Donation? (drmalpani.com)
You may consider sperm donation if your partner produces very little or no sperm (azoospermia). (drmalpani.com)
Women in same sex relationships will also need to have sperm donation if either or both of them want to get pregnant. (drmalpani.com)

1) withdrawal (2) rhythm method (3) condom (4) spermicide (5) estrogen/ progesterone (6) IUD (7) vasectomy (8) tubal ligation A. kills sperm B. keeps sperm out of vagina or from entering cervix C. prevents implantation of a blastocyst D. no intercourse during fertile times E. penis removed from vagina before ejaculation F. sperm cells never reach penis G. prevents follicle maturation and ovulation H. oocytes never reach uterus. (quizlet.com)
Due to its length, the epididymal duct allows space for storage and maturation of sperm. (medscape.com)

A 2020 study conducted in Denmark on more than 2,000 men found that daily e-cigarette users had significantly lower total sperm count compared to non-users. (dailymail.co.uk)

Frequent visits to the sauna may lower men's sperm count, although the effect appears to be temporary, a new study finds. (livescience.com)

The sauna sessions lowered the men's sperm counts , and they remained below normal for three months after the men stopped visiting the sauna, compared with the levels at the study's start. (livescience.com)

Using this criterion, any subnormally (or borderline forms) classified sperm cells are going to be indicated as abnormal. (myhealth.gov.my)

suspect that this unusual swimming behaviour guides sperm through a small hole in the protective coating of fish eggs, which eventually leads to fertilization. (elifesciences.org)
Soon after fertilization, the vast majority of methylcytosine in sperm is converted by the Tet3 enzyme to hydroxymethylcytosine that gets lost by dilution during replication, effectively erasing cytosine methylation patterns except for a subset that is maintained, including those of some imprinted genes. (i-sis.org.uk)
After fertilization, the sperm genome is rapidly stripped of protamines and most, but not all histones. (i-sis.org.uk)
Sperm have thin structures known as flagella whose motion must be regulated in order to reach the egg for fertilization. (mdpi.com)
Palestinian prisoners subjected to long years in prison by their oppressor seek escape and meaning to life through smuggling their sperm to their wives at health centers specializing in fertilization. (electronicintifada.net)
The conception process takes place when a sperm cell from the male unites with an ovum (egg) in the female's fallopian tube in a process called fertilization. (bartleby.com)
This gives them a head start and offers a better chance at fertilization. (drmalpani.com)
Donated sperm may be used for insemination through intrauterine insemination or in vitro fertilization . (drmalpani.com)
After the sperm enters the oval cytoplasm in the uterine tube, the maternal and paternal chromosomes combine to form a zygote, completing fertilization. (medscape.com)
DS originates from the inadequate separation of chromosome 21, which may occur in the gamete formation phase (egg or sperm) or immediately after fertilization in meiosis or in mitosis, respectively. (bvsalud.org)

In cases of nonobstructive (secretory) azoospermia, on the other hand, testicular sperm production is blocked at different stages of the process of sperm formation (spermatogenesis). (wikipedia.org)

In 2009, researchers identified a potassium ion channel, called CNGK, that starts the electrical signal in the sperm cells of sea urchins. (elifesciences.org)
including some of the researchers involved in the 2009 work - now report that the CNGK channel also exists in the sperm cells of a freshwater fish, the zebrafish. (elifesciences.org)
This might explain why sperm production is less efficient during sauna exposure, the researchers said. (livescience.com)
In a cave in Australia, researchers from the University of New South Wales discovered giant fossilized sperm. (mongabay.com)
The researchers speculate the sperm were fossilized so well because they were buried in "tons" of bat guano, which preserved the sperm before they could decay. (mongabay.com)
The researchers found that sperm counts have fallen from 99 million per millilitre (ml) in 1973 to just 47.1 million per ml 38 years later. (thejournal.ie)
The study, conducted by researchers from the University of Padova, in Italy, said that their findings mean doctors and men should see sperm count as an early symptom for possible illnesses later in life. (asianage.com)

These findings suggest that while channel proteins found in sperm cells from different species look similar and serve similar roles, they are activated in ways that can be very different. (elifesciences.org)
In mammals, most histone proteins are lost during sperm development, eventually to be replaced by protamines. (i-sis.org.uk)

The study - by highly respected specialists - found that sperm levels of men who kept their phones in their pocket during the day were seriously affected in 47 per cent of cases compare to just 11 per cent in the general population. (scienceblogs.com)

In order to fit in their bodies, the sperm are kept tightly coiled in the males' sperm ducts until they're transferred to females, which collect 50 to 100 sperm in specific receptacles during a lengthy mating process. (mongabay.com)

Due to Israeli prison restrictions against Palestinians, this requires sperm smuggling and artificial insemination . (electronicintifada.net)
Part of the solution said to be artificial insemination or IVF, but sperm banks are very low on stocks. (bioedge.org)
Five members of staff were jailed for selling 1,000 sperm samples, mostly to medical clinics providing unlicensed insemination services. (bioedge.org)
In case of intrauterine insemination, the sperms are injected right into the woman's uterus, so that they do not have to travel too far to reach the eggs. (drmalpani.com)
In terms of insemination, ICSI needs only one sperm cell per oocyte , while IVF needs 50,000-100,000. (wikipedia.org)

Nicotine has long been tied to reduced sperm counts and low sperm density, when there are fewer sperm available to fertilize an egg and begin a pregnancy. (dailymail.co.uk)
Too little sperm in an ejaculation might make it more difficult to get pregnant because there are fewer candidates available to fertilize the egg. (mayoclinic.org)
To reach and fertilize an egg, sperm must move - wriggling and swimming through a female cervix, uterus and fallopian tubes. (mayoclinic.org)
This sperm is used to fertilize the egg inside or outside the woman's body. (drmalpani.com)
In case of IVF, sperms is used to fertilize the eggs in a laboratory, in vitro. (drmalpani.com)

In the fallopian tube, the capable spermatozoa pass through the cells of the cumulus and adhere to a second cellular barrier surrounding the oocyte: the zona pellucida .This causes a reaction in the head of some spermatozoa, which release enzymes that allow them to cross the zona pellucida. (quizlet.com)
Assessing approximately 200 spermatozoa and the value of normal sperm is calculated in percentage. (myhealth.gov.my)

The modern freshwater ostracod Eucypris virens (1.5 millimeters long) also uses giant sperm cells for reproduction, although it is not a record holder with sperm being around 1.2 times as long as the male's body. (mongabay.com)
As yet, scientists aren't sure why giant sperm evolved, but speculate that it seems to have conferred significant advantageous as sperm gigantism evolved in many different species and in many different forms. (mongabay.com)
A coiled bundle of giant sperm cells from the male's seminal vesicle of the modern Australian salt lake ostracod, Mytilocypris mytiloides. (mongabay.com)
Giant sperm cells of a modern Australian salt lake ostracod, Mytilocypris mytiloides. (mongabay.com)

Stress can decrease sexual function and interfere with the hormones needed to produce sperm. (mayoclinic.org)
The seminiferous tubules are lined with germ cells that produce sperm and nutrient fluid. (medscape.com)

The head of the sperm cell contains the male's genetic information that is to be passed on to the next generation. (medlineplus.gov)

This is because the acrosome reaction has to take place and thousands of sperm cells have to be involved in IVF. (wikipedia.org)

Mean semen volume and sperm concentrations were nonsignificantly decreased in the EDB exposed workers. (cdc.gov)

Unexpectedly, the CNGK channel is located in the heads of this fish's sperm cells rather than in the tails. (elifesciences.org)
In contrast, the sperm cells of other animals, like these human sperm, have long tails. (mongabay.com)
Typical sperm have oval heads and long tails, which work together to propel them. (mayoclinic.org)
Buffone, M.G. Heads or tails? (uba.ar)
Heads or tails? (uba.ar)
however, the exposed workers showed significant increases in the proportion of sperm with tapered heads, absent heads, and abnormal tails. (cdc.gov)

A study reveals that a man's weight affects the heritable information contained in sperm. (sciencedaily.com)
More needs to be learned about what these differences mean and their effects on offspring, but it is early evidence that sperm carries information about a man's health. (sciencedaily.com)

Sperm flagellar 2 (SPEF2) is essential for sperm flagellar assembly in humans. (nih.gov)
In contrast, humans have some of the smallest sperm, at 0.004 centimeters (0.002 inches). (mongabay.com)

Sperm make their way to an egg by swimming against a current of mucus that streams through the cervix and away from the uterus. (sciencenews.org)

It is worn tightly around the head of the penis, and the sphere is inserted into the urethra. (stockroom.com)

The sperm cells of lean and obese men possess different epigenetic marks, notable at gene regions associated with the control of appetite. (sciencedaily.com)
In general, sperm cells become attracted to egg cells by various chemical or physical signals. (elifesciences.org)
The study also found that sauna exposure affected the way DNA was packed into the sperm cells, and impaired the mitochondria, the cell's powerhouse. (livescience.com)
Given that sperm can't see where they're going, reader Donald Bruns wondered how the cells know the way to go. (sciencenews.org)
In the testes, this protein regulates the division of sperm cells. (medlineplus.gov)
This lack of aurora kinase C blocks cell division in sperm cells. (medlineplus.gov)
Without cell division, the chromosomes are not split among multiple new sperm cells. (medlineplus.gov)
As a result, affected sperm cells contain extra chromosomes, usually four copies of each instead of the usual one. (medlineplus.gov)

Fluid from the seminal vesicles and prostate gland combine with sperm to make semen. (mayoclinic.org)
The epididymal head overhangs the upper pole of the testis, receives the seminal fluid from the ducts of the testis (which pierce the upper portion of the mediastinum), then allows the passage of the sperm into the distal portion of the epididymis. (medscape.com)

A higher sperm count typically translates to a higher likelihood of causing a pregnancy. (dailymail.co.uk)
Previous studies have also suggested that frequent use of hot tubs, as well as sitting for long stretches with a laptop on the lap , can temporarily lower sperm count, according to the Mayo Clinic. (livescience.com)
Some research suggests that increasing body mass index (BMI) is linked with decreasing sperm count and sperm movement. (mayoclinic.org)
FILE - Study finds common pesticides in food are reducing sperm count worldwide. (witn.com)
But it is not just pesticides that are affecting sperm count. (witn.com)

During this fundamental transition the species-specific sperm head is formed, which necessitates profound nuclear restructuring coincident with the assembly of sperm-specific structures and chromatin compaction. (uni-wuerzburg.de)
Ca 2+ induces spinning-like swimming, different from swimming of sperm from other species. (elifesciences.org)
In zebrafish sperm, a more alkaline pH inside the cell causes calcium ions to flow in and this influx of calcium ions triggers a unique spinning-like swimming movement that is different from the swimming of other sperm from other species. (elifesciences.org)
Sperm size varies with each species, with ostracods producing some of the largest sperm relative to body size of any animal. (mongabay.com)
However, the current record-holder for largest sperm goes to Drosophila bifurca , a species of fruit fly, whose sperm can be up to 5.8 centimeters (2.3 inches) long. (mongabay.com)
Large numbers of sperm are typically needed in this process and some species have sperm that exhibit collective or aggregate motion when swimming in groups. (mdpi.com)

Sperm counts among men in western countries dropped by over 50% between 1973 and 2011. (thejournal.ie)
CNN) - Sperm counts among men have been in decline for the last 50 years, and a new analysis has found pesticides may be contributing to that. (witn.com)

The mother, known only as Eva, had a child using Meijer's sperm in 2018. (yahoo.com)

The toxic chemicals used to give vapes their fruity or minty flavor are also feared to damage the body's production of sperm, and their ability to swim. (dailymail.co.uk)
Rats exposed to cigarette smoke had smaller and lighter testes than the e-cigarette and unexposed groups and lower number of sperm able to swim. (dailymail.co.uk)
This makes the sperm tend to swim into the oncoming current, he says. (sciencenews.org)

Located in sperm flagellum. (nih.gov)
Calcium in the flagellum controls sperm navigation. (elifesciences.org)
It is located in the sperm head rather than the flagellum and is controlled by intracellular pH, but not cyclic nucleotides. (elifesciences.org)

2001). Sperm Morphological defects Related to Environment, Lifestyle and Medical History of 1001 male Partners of Pregnant Women from Four European Cities. (myhealth.gov.my)

The procedure of using these sperms varies from one clinic to the other. (drmalpani.com)

Woman filmed giving head and swallowing sperm in public train - real public exposure and fucking in public video. (hiddenvoyeurspy.com)
Sperm can be especially vulnerable to environmental factors, such as exposure to excessive heat or toxic chemicals. (mayoclinic.org)

The "spinning" mode probably guides sperm into the micropyle, a narrow entrance on the surface of fish eggs. (elifesciences.org)

Anatomy18

Organisms2

Diseases3

Chemicals and Drugs7

Analytical, Diagnostic and Therapeutic Techniques and Equipment11

Phenomena and Processes13

Technology, Industry, Agriculture1

Health Care1

Motility9

Fertility15

Morphology7

Mammalian sperm1

Whales47

Million sperm per milliliter2

Abnormalities6

Whale13

Measuring sperm count1

Tail9

Misshapen3

Abnormal sperm2

Affect sperm2

Intracytoplasmic3

Donor11

Testicles6

Concentration3

Ejaculate3

Infertility6

Donation7

Maturation2

Total sperm count1

Lower men's sperm1

Men's sperm counts1

Classified sperm cells1

Fertilization10

Testicular1

Researchers7

Proteins2

Found that sperm1

Males1

Insemination5

Fertilize5

Spermatozoa2

Giant sperm4

Produce sperm2

Male's1

Acrosome1

Semen volume1

Tails6

Man's2

Humans2

Cervix1

Penis1

Cells8

Seminal2

Count5

Species6

Counts among2

20181

Swim3

Flagellum3

Defects1

Clinic1

Exposure2

Eggs1