Help sperm tail. 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)
The genetic quality of sperm, as well as its volume and motility, all typically decrease with age. (wikipedia.org)
Structural events and molecular mechanisms that promote mammalian sperm acrosomal exocytosis and motility. (uba.ar)
Here we summarize our years of results for additional parameters with more detail for sperm morphology and motility. (ivis.org)
However, in the 200 and 800 mg/kg groups the relative and absolute weights of testis and epididymis were significantly decreased.The results of sperm analysesshowedsignificantlyreduced ofsperm motility, viability, survivability and the number of sperms in the left epididymis in the group treated with 50 mg/kg or more of the test chemical compared with controls. (europa.eu)
In vitro clinic: Low epididymal sperm concentration, many sperm have abnormally shaped heads, sperm tails are short, no sperm motility, no IVF success. (jax.org)
In mammals, adenosine 3', 5'-cyclic monophosphate (cAMP) is known to play highly important roles in sperm motility and acrosomal exocytosis. (plos.org)
It is involved in flagellar movements and motility, and in cellular events that occur in the sperm head, that will lead to successful interaction with the egg and to fertilization [ 1 , 2 ]. (plos.org)
The motility of sperm mirrors this imagery, reflecting the sperm's capability to maneuver effectively. (natural-fertility-prescription.com)
In order for sperm to successfully reach the egg, an adept motility is non-negotiable. (natural-fertility-prescription.com)
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)
Sperm motility is affected by proteins called myosins, which are found in the tail of each sperm cell. (erec-renewables.org)
Sperm-specific proteins have important roles in FERTILIZATION including SPERM MOTILITY and SPERM-OVUM INTERACTIONS. (bvsalud.org)

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)
More studies of fertility outcomes in large populations are required to refine the application of CASA to measuring sperm morphology. (myhealth.gov.my)
The sperm parameters including sperm motion, morphology, viability and survivability were recorded in males. (europa.eu)
The percentage of sperms with abnormal morphology significantly increased in 50, 200 and 800 mg/kg groups in comparison to control. (europa.eu)
Histology evaluation: Abnormal spermiogenesis (see 1) characterized by abnormally shaped sperm heads and abnormal tail morphology. (jax.org)
Delving into the microscopic realm, the shape and structure of the sperm - its morphology - plays a pivotal role. (natural-fertility-prescription.com)
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)
Morphology: 85-90% are normal, 10-15% sperms are abnormal. (ndtv.com)
The Sperm Atlas illustrates and describes sperm morphology from animals at the San Diego Zoo Wildlife Alliance and other organizations. (libguides.com)
The Sperm Atlas is a sperm morphology database highlighting sperm cells collected from animals at the San Diego Zoo Wildlife Alliance and other contributing organizations. (libguides.com)

Isolated teratozoospermia does not affect in vitro fertilization outcome and is not an indication for intracytoplasmic sperm injection. (myhealth.gov.my)
This study was conducted to evaluate in vivo and in vitro development of in vitro-matured equine oocytes fertilized by intracytoplasmic sperm injection. (bioone.org)
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)

Animals produce motile sperm with a tail known as a flagellum, which are known as spermatozoa, while some red algae and fungi produce non-motile sperm cells, known as spermatia. (wikipedia.org)
Flowering plants contain non-motile sperm inside pollen, while some more basal plants like ferns and some gymnosperms have motile sperm. (wikipedia.org)
Standard semen analysis included percentage of motile sperm, status, sperm concentration, percentage of morphologically normal cells, pH and osmolality of seminal fluid. (ivis.org)
progressive and motile sperm = 46.58 and 60.27%, respectively). (frontiersin.org)

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)
Assessing approximately 200 spermatozoa and the value of normal sperm is calculated in percentage. (myhealth.gov.my)
2007) we correlated percentages of motile and of morphologically normal sperm with measures of inbreeding in Mexican wolves, but other aspects of semen quality were not reported. (ivis.org)
A normal sperm cell has an oval type head with a long linear tail. (mh.co.za)

Because their sperm do not move properly, males with primary ciliary dyskinesia are usually unable to father children. (medlineplus.gov)
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)
Local males produce huge, multi-tailed sperm. (freethoughtblogs.com)
All males were adult, i.e., 22 months of age or older, except one Mexican wolf that reached puberty at 10 months, documented by the presence of good quality sperm. (ivis.org)
All mutations were mapped to a chromosome region and all were archived as cryopreserved sperm from heterozygous males. (jax.org)
Females will mate with multiple males, whose sperm then compete to fertilize her eggs. (hummingbirdsplus.org)
As the female fish dig their tails into the sand and release eggs, males wrap around females and release sperm to fertilize those eggs. (sciencenews.org)

Loss of function of ODF1, therefore, might account for some of the cases of human infertility with decapitated sperm heads. (nih.gov)

DNA damages present in sperm cells in the period after meiosis but before fertilization may be repaired in the fertilized egg, but if not repaired, can have serious deleterious effects on fertility and the developing embryo. (wikipedia.org)
Building on his expertise in sperm biology, Dr. Travis and his team have developed a male fertility test that scores the likelihood that a man's sperm will be able to successfully fertilize an egg. (cornell.edu)
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)
Indeed, male fertility is just as paramount in this equation, and sperm health stands at its forefront. (natural-fertility-prescription.com)
Repeated exposure to detrimental chemicals, harmful radiation, or even chronic heat can curtail sperm production, putting a dent in one's fertility aspirations. (natural-fertility-prescription.com)
While testosterone is necessary for a wide variety of things, including sperm production, bone growth, and muscle development, its primary purpose is to help maintain male fertility. (erec-renewables.org)

Sperm cells form during the process known as spermatogenesis, which in amniotes (reptiles and mammals) takes place in the seminiferous tubules of the testes. (wikipedia.org)
THE IMPORTANT PROCESS IN MALE REPRODUCTIVE SYSTEM IS SPERMATOGENESIS Spermatogenesis is a process by which the male gametes, known as sperm is formed. (powtoon.com)
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)
The importance of phosphorylation in sperm during spermatogenesis has not been pursued extensively. (cdc.gov)

Pregnancy is possible with less than 40% of the sperm in ejaculate moving, but 40% is considered the threshold. (mayoclinic.org)
Infertile men may have deficiencies in sperm formation, concentration (eg, oligospermia [too few sperm], azoospermia [no sperm in the ejaculate]), or transportation. (medscape.com)
Mean sperm counts per ejaculate and percentage of viable sperm were significantly lower in the exposed workers. (cdc.gov)

Sperm quantity and quality are the main parameters in semen quality, which is a measure of the ability of semen to accomplish fertilization. (wikipedia.org)
The authors conclude: "Progesterone-activated endocannabinoid depletion by ABHD2 is a general mechanism by which progesterone exerts its genome-independent action and primes sperm for fertilization. (medicalnewstoday.com)
Naturally, a higher percentage of live sperm amplifies the chances of successful fertilization. (natural-fertility-prescription.com)
The process of in vitro fertilization (IVF) makes it possible to use dead sperm to help form a healthy fetus. (mh.co.za)

In mammals, sperm is stored in the epididymis and is released from the penis during ejaculation in a fluid known as semen. (wikipedia.org)
The epididymis is a long, coiled tube that stores sperm and transports it from the testes. (healthline.com)
Near the top of the testis is the head of the epididymis, which stores sperm until it is ready to undergo maturation. (healthline.com)
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)

Fluid from the seminal vesicles and prostate gland combine with sperm to make semen. (mayoclinic.org)
A coiled bundle of giant sperm cells from the male's seminal vesicle of the modern Australian salt lake ostracod, Mytilocypris mytiloides. (mongabay.com)
Introduction - Although sperm and seminal fluid of domestic dogs has been extensively studied, typically as part of artificial insemination programs, limited comparative data exist for other canid species. (ivis.org)
Osmolality of seminal fluid was measured with an osmometer after centrifugation to remove sperm, and pH of semen was quantified either by paper strips or a pH meter. (ivis.org)

Healthy sperm aren't always a given. (mayoclinic.org)
What's the best way to produce healthy sperm? (mayoclinic.org)
This article delves deep into the basics of sperm health and the parameters that define healthy sperm, offering an informed understanding for couples around the globe. (natural-fertility-prescription.com)
As per the standards set by the World Health Organization, a healthy sperm count spans from 15 million to over 200 million sperm per milliliter of semen. (natural-fertility-prescription.com)
Healthy sperm predominantly display an oval head paired with a long tail. (natural-fertility-prescription.com)
3. The temperature of healthy sperm is important. (mh.co.za)

Micrographs of the sea urchin spermatozoa treated with the new fixative provide more detailed information on the tail structure than has heretofore been obtainable. (rupress.org)
Will show spermatozoa red bodies with the midpiece and tail sections green. (sargentwelch.com)
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)

Testicles produce sperm. (mayoclinic.org)
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)

clarification needed] The mammalian sperm cell can be divided in 2 parts: Head: contains the nucleus with densely coiled chromatin fibers, surrounded anteriorly by a thin, flattened sac called the acrosome, which contains enzymes used for penetrating the female egg. (wikipedia.org)

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)
In order to swim, sperm cells rely on special membrane proteins, called ion channels, that regulate ion flow. (acsh.org)
For the calcium to enter, a sperm protein known as CatSper needs to join with similar proteins in the flagella. (medicalnewstoday.com)
Without testosterone, however, these proteins can't bind properly and the sperm become immobilized. (erec-renewables.org)
Normally, RhoA keeps the actin filament unbound, allowing the myosin proteins in the tail of the sperm to move around freely. (erec-renewables.org)
Proteins found in sperm. (bvsalud.org)
Sperm-specific proteins are also important for early EMBRYO DEVELOPMENT. (bvsalud.org)

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)
Fundamentally, sperm health encompasses the sperm's ability to effectively fertilize an egg. (natural-fertility-prescription.com)
This results in the immobilization of the sperm, preventing it from moving along to fertilize an egg. (erec-renewables.org)
These defects affect the sperms ability to reach and fertilize an egg. (mh.co.za)

Due to its length, the epididymal duct allows space for storage and maturation of sperm. (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)
In vitro clinic: Very low testis weight, no epididymal sperm recovered. (jax.org)
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)

Sperm, which are about 50 µm long, respond to progesterone via a calcium channel. (acs.org)
Specialized cells that surround and nourish egg cells release progesterone, which makes calcium ions rush into human sperm. (acs.org)
The new research suggests that progesterone works by opening a pH-sensitive calcium channel called CatSper, which resides on sperm tail membranes. (acs.org)
According to another model, the female sex hormone progesterone - which is formed by cumulus cells near the ovum - attracts the sperm. (mpg.de)
In a 2011 study, which was seen as a sensational breakthrough, scientists from the caesar research centre succeeded in showing that progesterone opens the CatSper channels directly and calcium flows through the channels into the sperm cell. (mpg.de)
Unconventional endocannabinoid signaling governs sperm activation via sex hormone progesterone. (acsh.org)
Next, they exposed the sperm to progesterone. (medicalnewstoday.com)
Eventually, using modified progesterone, the team isolated the enzyme alpha/beta hydrolase domain containing protein 2 (ABHD2) from the sperm tails. (medicalnewstoday.com)
With the ABHD2 inactivated, progesterone was unable to activate the sperm cells. (medicalnewstoday.com)

This not only involves the percentage of sperm that move but also the qualitative aspect of this movement. (natural-fertility-prescription.com)
In the grand tapestry of conception, vitality stands as a measure of the percentage of live sperm within a given semen sample. (natural-fertility-prescription.com)

Poor sperm function is a common cause of infertility in animals and humans alike, but there are currently few easy and accurate tests for diagnosing the problems involved. (cornell.edu)
Infertility in men can result from deficiencies in sperm formation, concentration, or transportation. (medscape.com)
Indications for performing a postcoital test include semen hyperviscosity, increased or decreased semen volume with good sperm density, or unexplained infertility. (medscape.com)
Scientists have discovered the "switch" that activates sperm cells to travel to the egg, potentially paving the way for new methods of male contraception and infertility treatment. (medicalnewstoday.com)
Out of these, 18% were diagnosed with a male-related infertility problem, 14% of which related to sperm or semen. (medicalnewstoday.com)
The findings may give hope to people affected by infertility due to low sperm mobility. (medicalnewstoday.com)
Earlier this year, Medical News Today reported that stem cells could be used to create sperm in order to overcome male infertility that results when meiosis does not occur. (medicalnewstoday.com)
Mutagenesis-generated mouse models of human infertility with abnormal sperm. (jax.org)
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)

Typical sperm have oval heads and long tails, which work together to propel them. (mayoclinic.org)
In contrast, the sperm cells of other animals, like these human sperm, have long tails. (mongabay.com)

As in somatic cells, sperm intracellular cAMP concentration is regulated by the opposite action of two enzymes: the adenylyl cyclases (AC), which synthesize cAMP from ATP, and the phosphodiesterases (PDE), which break the phosphodiester bond of cAMP to form 5'-adenosine monophosphate (AMP). (plos.org)

Researchers first discovered this ingenious system in sea urchins and found out that attractants control the swimming movement of the sperm by altering their calcium balance. (mpg.de)
Melissa R. Miller and colleagues - from the University of California-Berkley, the University of California-San Francisco and Yale University School of Medicine in New Haven, CT - set out to pinpoint exactly what triggers the movement of the sperm. (medicalnewstoday.com)

The main sperm function is to reach the ovum and fuse with it to deliver two sub-cellular structures: (i) the male pronucleus that contains the genetic material and (ii) the centrioles that are structures that help organize the microtubule cytoskeleton. (wikipedia.org)
Sperm have a long journey ahead in their quest for the egg cell or ovum, and just a few of the million sperm reach their destination. (mpg.de)
The ovum supports the sperm in their quest by transmitting "chemical signposts", known as attractants. (mpg.de)
Using different "chemical signposts", the sperm must repeatedly reassure themselves on their difficult journey to the ovum that they are still on the right track. (mpg.de)
With the help of the CatSper channels as versatile and highly perceptive sensors, sperm can "read" the chemical milieu in the fallopian tube and find the ovum in this way. (mpg.de)

It plays a key role during sperm capacitation [ 3 - 6 ] and the acrosomal exocytosis [ 7 - 10 ], where it affects different intracellular signalling pathways. (plos.org)

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

Heavy drinking can lead to reduced testosterone production, impotence and decreased sperm production. (mayoclinic.org)

One of the more promising technologies is called Vasalgel , a polymer that is injected directly into the vas deferens , the tube that carries sperm out of the testicles. (acsh.org)

Sperm cells cannot divide and have a limited lifespan, but after fusion with egg cells during fertilisation, a new organism begins developing, starting as a totipotent zygote. (wikipedia.org)
Sperm cells are carried out of the male body in a fluid known as semen. (wikipedia.org)
Human sperm cells can survive within the female reproductive tract for more than 5 days post coitus. (wikipedia.org)
The "Lily of the Valley phenomenon" - also the title of a book about smelling - was born as a result of this discovery that sperm act as swimming olfactory cells which follow a "scent trail" laid by the egg. (mpg.de)
Scientists from the caesar research centre in Bonn, an Institute of the Max Planck Society, have now discovered that sperm do not function like olfactory cells - a finding that casts doubt on the assumption that scents play a role in fertilisation. (mpg.de)
Flagella are tail-like structures, similar to cilia, that propel sperm cells forward. (medlineplus.gov)
Vigorous movements of the flagella are necessary to propel the sperm cells forward to the female egg cell. (medlineplus.gov)
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)
Giant sperm cells of a modern Australian salt lake ostracod, Mytilocypris mytiloides. (mongabay.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 a nutshell (no pun intended), preventing a single egg cell from being fertilized is simpler than deactivating the 40 million to 1.2 billion sperm cells found in a single ejaculation. (acsh.org)
Some ion channels, however, are unique to sperm cells, and these could be attractive targets. (acsh.org)
Sperm cells are not very mobile. (medicalnewstoday.com)
They get mature and developed into four sperm cells with the growth of microtubules on the centrioles to develop an axoneme. (powtoon.com)
Drawing parallels from other bodily cells, sperm health is deeply nurtured by a well-balanced diet rich in antioxidants, vitamins, and minerals. (natural-fertility-prescription.com)
This is because the acrosome reaction has to take place and thousands of sperm cells have to be involved in IVF. (wikipedia.org)
One way in which testosterone promotes sperm production is through the stimulation of Leydig cells. (erec-renewables.org)
Sperm cells are actually a part of semen, "Semen is the whitish, viscous fluid released from the penis", according to MedlinePlus . (mh.co.za)

It is generally accepted that isogamy is the ancestor to sperm and eggs. (wikipedia.org)
However, there are no fossil records for the evolution of sperm and eggs from isogamy leading there to be a strong emphasis on mathematical models to understand the evolution of sperm. (wikipedia.org)
Unlike in sea urchins, which release sperm and eggs into the seawater, the conditions in the narrow human fallopian tube are very difficult to emulate in experiments. (mpg.de)
Unlike eggs fertilized naturally (with sperm), the laboratory-made eggs received genetic material from only one source. (msdmanuals.com)

The CatSper channels, which are found only in sperm, play an indispensable role in reproduction: men who carry a gene defect for CatSper are infertile. (mpg.de)
The CatSper channel: a polymodal chemosensor in human sperm. (mpg.de)
The ion channel CatSper, for instance, regulates calcium ion flow in the sperm's tail. (acsh.org)
The team first exposed sperm to a chemical that inhibits a particular class of enzyme, because they suspected that the molecule that acts on CatSper might feature within that class of enzymes. (medicalnewstoday.com)
They noted that the sperm remained inactive, suggesting that CatSper was not directly involved in the process. (medicalnewstoday.com)

Once the ATP molecules are broken down, the sperm lose their ability to swim. (erec-renewables.org)

Sperm (PL: sperm or sperms) is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one). (wikipedia.org)
The male reproductive system makes, stores and moves sperm. (mayoclinic.org)
The reproductive NOAEL (No Observed Adverse Effect Level) for male SD rats was 12,5 mg/kg/day based on findings of necropsy, organ weight measurement, sperm test findings and histopathology. (europa.eu)
This is an important advance in explaining how sperm become hypermotile in the female reproductive tract. (medicalnewstoday.com)
This architecture enables the sperm to propel itself forward, navigating through the intricate channels of the female reproductive tract. (natural-fertility-prescription.com)
This is needed for healthy reproductive sperm. (mh.co.za)
Sperm regenerates at a rate of two-and-a-half to three months in order to mature into healthy reproductive sperm cell. (mh.co.za)

We tested a sample of 234 wild long-tailed macaques ( Ma- distemper virus nucleoprotein RNA by reverse transcription-PCR using serum, whole blood, and cerebrospinal fluid from dogs with caca fascicularis ) trapped in Peninsular Malaysia in 2009, distemper. (cdc.gov)

Building on their past studies of sperm's energy-making enzymes, Dr. Travis and his colleagues have mimicked the way these enzymes are organized in the tail, called a "flagellum", to create enzyme machines powered by sugar. (cornell.edu)

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)

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)

Exposure to pesticides, lead and other toxins can affect sperm quantity and quality. (mayoclinic.org)

Although headless tails are somehow motile, transmission electron microscopy revealed disturbed organization of the mitochondrial sheath, as well as of the outer dense fibers. (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)
In addition, ostracod sperm have a tough outer coating that likely aided their preservation. (mongabay.com)
In order for the sperm cell to increase mobility, calcium must also pass through its outer membrane and enter the "tail," or flagella, which it uses to propel itself along. (medicalnewstoday.com)

The tail was formerly thought to move symmetrically in a helical shape. (wikipedia.org)
Traditional microscopes make it look like sperm tails undulate symmetrically -- but that's an optical illusion. (insidescience.org)

Oocytes were collected from slaughterhouse-derived ovaries, matured in vitro, and injected with frozen-thawed stallion sperm. (bioone.org)

While they make the difficult migration, the females store the male sperm in suspended animation. (creationmoments.com)

The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell with 46 paired chromosomes. (wikipedia.org)
In this process, each sperm is haploid, containing a single copy of each chromosome.In order to create the haploid gamete, a cell undergoes the process of meiosis in which the genome is replicated and divided twice to produce four haploid gametes. (powtoon.com)

This new study shows that the mathematical basis of these patterns also governs how the sperm tail moves. (bristol.ac.uk)

Buffone, M.G. Heads or tails? (uba.ar)
Heads or tails? (uba.ar)
Like Blakley, Bayardo presumed Stites was sexually assaulted, took vaginal swabs, and found sperm with both heads and tails intact. (findlaw.com)
He also took rectal swabs but found only sperm heads with no tails. (findlaw.com)
however, the exposed workers showed significant increases in the proportion of sperm with tapered heads, absent heads, and abnormal tails. (cdc.gov)

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)
The entire cell is comprised of an extremely elongated "sperm-head. (mongabay.com)
The drag between the head of the sperm and the wall slows the sperm down and swings its tail downstream. (sciencenews.org)
These include tail paint, Kamar Heatmount Detectors, Estrotect Heat Detectors, Bovine Beacon, tail head markers, chin-ball markers, and the HeatWatch II System, an electronic detection system that records mounting behavior. (msucares.com)
Some may have defects in the head, neck, tail such as - coiled tails, more than one head etc. (mh.co.za)
Such propagation is also possible with simple animals such as flatworms: cut a flatworm in two, and the tail grows a new head and the head grows a new tail. (msdmanuals.com)

From here, the sperm is transported to the ejaculatory duct. (healthline.com)

A structural abnormality of the tail is described that is characterized by two or three complete sets of tail filaments within one cell membrane. (rupress.org)
This process involves the production of several successive sperm cell precursors, starting with spermatogonia, which differentiate into spermatocytes. (wikipedia.org)
Sperm cell as TPS character, monster or a minion with procedural tail animations effects. (unrealengine.com)
In terms of insemination, ICSI needs only one sperm cell per oocyte , while IVF needs 50,000-100,000. (wikipedia.org)
But when testosterone binds to receptors on the surface of the sperm cell, it prevents RhoA from binding to actin filaments. (erec-renewables.org)
When combining a sperm cell and an egg and then transferring the embryo to the uterus manually the way IVF technicians do. (mh.co.za)

The "Lily of the Valley phenomenon" is a laboratory artefact: sperm do not have an olfactory signalling pathway. (mpg.de)

Copying a molecular design they discovered in the sperm tail, Travis and his colleagues, including Baker Institute Research Scientist Dr. Roy Cohen , have developed a device that can diagnose stroke in less than ten minutes using less than a drop of blood. (cornell.edu)
Earlier this year, the lab also published a paper in the journal Science , which elucidated some of the molecular mechanisms behind sperm activation . (acsh.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)
2001/11/01 11:30 (480,912) comet faint and small but seem condensed moving on an apparent Kreutz orbit, no tail. (navy.mil)
2001/11/01 11:54 (468,880) comet faint and small but seem condensed moving on an apparent Kreutz orbit, no tail. (navy.mil)

A widespread hypothesis states that sperm evolved rapidly, but there is no direct evidence that sperm evolved at a fast rate or before other male characteristics. (wikipedia.org)
Not all sperm are chromosomally male. (mh.co.za)

Another part of testosterone that helps control reproduction involves the regulation of sperm mobility. (erec-renewables.org)

Not only is testosterone necessary for producing sperm, but it also aids in maintaining sperm viability. (erec-renewables.org)

They would like not to be called sperm whales, if you please. (funtrivia.com)
Dolphin morbillivirus associated with a mass stranding of sperm whales, Italy. (cdc.gov)

Anatomy14

Organisms1

Diseases1

Chemicals and Drugs5

Analytical, Diagnostic and Therapeutic Techniques and Equipment7

Phenomena and Processes14

Information Science3

Health Care1

Motility16

Morphology13

Intracytoplasmic sperm inj4

Motile sperm4

Normal sperm4

Males7

Decapitated sperm heads1

Fertility9

Spermatogenesis4

Ejaculate3

Fertilization4

Epididymis4

Seminal4

Healthy sperm6

Spermatozoa3

Produce sperm3

Mammalian sperm1

Proteins7

Fertilize5

Maturation1

Testis3

Progesterone9

Percentage2

Infertility9

Long tails2

Concentration1

Movement of the sperm2

Ovum5

Capacitation1

Classified sperm cells1

Decreased sperm production1

Testicles1

Cells18

Eggs4

CatSper5

Ability to S1

Reproductive7

Fluid1

Sperm's1

Whose sperm1

Giant sperm1

Affect sperm1

Outer4

Symmetrically2

Vitro1

Females1

Haploid2

Governs1

Heads5

Head6

Ejaculatory1

Cell6

Olfactory1

Molecular2

20013

Male2

Mobility1

Viability1

Whales2