Loading...
  • sphenoid sinus
  • finally, below and behind (posteroinferior) the cribriform plate, sloping down at an angle, is the bony face of the sphenoid sinus. (wikipedia.org)
  • Skull fractures occur more easily at the thin squamous temporal and parietal bones, the sphenoid sinus, the foramen magnum (the opening at the base of the skull that the spinal cord passes through), the petrous temporal ridge, and the inner portions of the sphenoid wings at the base of the skull. (wikipedia.org)
  • recess
  • prostatic sinus the posterolateral recess between the seminal colliculus and the wall of the urethra, where the prostatic ductules empty into the urethra. (thefreedictionary.com)
  • The frontal bone is membranous at birth and there is rarely more than a recess until the bone tissue starts to ossify about age two. (wikipedia.org)
  • Possible explanations for this might be the relatively long and delicate nasofrontal duct that connects the narrow frontal recess with the frontal sinuses. (wikipedia.org)
  • skull
  • The biological role of the sinuses is debated, but a number of possible functions have been proposed:[citation needed] Decreasing the relative weight of the front of the skull, and especially the bones of the face. (wikipedia.org)
  • Sinuses are mucosa-lined airspaces within the bones of the face and skull. (wikipedia.org)
  • These bones are expanded into broad, flat plates, as in the cranium (skull), the ilium (pelvis), sternum and the rib cage. (wikipedia.org)
  • The intervening cancellous tissue is called the diploë, and this, in the nasal region of the skull, becomes absorbed so as to leave spaces filled with air-the paranasal sinuses between the two tables. (wikipedia.org)
  • shown in red) Flat bones in human skull. (wikipedia.org)
  • It is situated in the middle of the skull towards the front, in front of the temporal bone and the basilar part of the occipital bone. (wikipedia.org)
  • An osteoma (plural: "osteomata") is a new piece of bone usually growing on another piece of bone, typically the skull. (wikipedia.org)
  • Most individuals have four paired cavities located in the cranial bone or skull. (wikipedia.org)
  • Sphenoid sinuses that are located behind the eyes and lie in the deeper recesses of the skull. (wikipedia.org)
  • The presence of sinus cavities within the cranial bone (skull) is essential for the following reasons: Sinus cavities allow for voice resonance They help filter and add moisture to any air that is inhaled through the nasal passages. (wikipedia.org)
  • Sinus Cavities provide a means to lighten the overall weight of the skull. (wikipedia.org)
  • Additionally, the sinuses within the skull are able to drain through the nasal passage. (wikipedia.org)
  • These consist of: Frontal sinuses: Occupy the dorsal (top) part of the skull, between the eyes. (wikipedia.org)
  • A skull fracture is a break in one or more of the eight bones that form the cranial portion of the skull, usually occurring as a result of blunt force trauma. (wikipedia.org)
  • If the force of the impact is excessive, the bone may fracture at or near the site of the impact and cause damage to the underlying physical structures contained within the skull such as the membranes, blood vessels, and brain. (wikipedia.org)
  • Basilar fractures are in the bones at the base of the skull. (wikipedia.org)
  • The bones of the skull are in three layers: the hard compact layer of the external table (lamina externa), the diploë (a spongy layer of red bone marrow in the middle, and the compact layer of the inner table (Lamina interna). (wikipedia.org)
  • Areas of the skull that are covered with muscle have no underlying diploë formation between the internal and external lamina, which results in thin bone more susceptible to fractures. (wikipedia.org)
  • Linear skull fractures are breaks in the bone that transverse the full thickness of the skull from the outer to inner table. (wikipedia.org)
  • Linear skull fractures are usually of little clinical significance unless they parallel in close proximity or transverse a suture, or they involve a venous sinus groove or vascular channel. (wikipedia.org)
  • In young children, although rare, the possibility exists of developing a growing skull fracture especially if the fracture occurs in the parietal bone. (wikipedia.org)
  • The vertebral column usually contains 54 bones: 7 cervical vertebrae, including the atlas (C1) and axis (C2) which support and help move the skull, 18 (or rarely, 19) thoracic, 5-6 lumbar, 5 sacral (which fuse together to form the sacrum), and 15-25 caudal vertebrae with an average of 18. (wikipedia.org)
  • parietal
  • pterygoid notch pterygoid fossa scaphoid fossa pterygoid hamulus pterygoid canal pterygospinous process sella turcica The sphenoid articulates with the frontal, parietal, ethmoid, temporal, zygomatic, palatine, vomer, and occipital bones and helps to connect the neurocranium to the facial skeleton. (wikipedia.org)
  • inferior
  • Aegyptopithecus zeuxis shares characteristics with haplorrhines such as a fused mandibular and frontal symphyses, postorbital closure, and superior and inferior transverse tori. (wikipedia.org)
  • coronary sinus
  • coronary sinus the dilated terminal portion of the great cardiac vein, receiving blood from other veins draining the heart muscle and emptying into the right atrium. (thefreedictionary.com)
  • vomer
  • The vomer bone lies below and to the back (posteroinferiorly), and partially forms the choanal opening into the nasopharynx, (the upper portion of the pharynx that is continuous with the nasal passages). (wikipedia.org)
  • The nasal septum is composed of the quadrangular cartilage, the vomer bone (the perpendicular plate of the ethmoid bone), aspects of the premaxilla, and the palatine bones. (wikipedia.org)
  • distal
  • In patients with more profound anemia, changes may be noted in the distal bones of the extremities. (medscape.com)
  • The horse's proximal digital sesamoids are simply called the "sesamoid bones" by horsemen, his distal digital sesamoid is referred to as the navicular bone. (wikipedia.org)
  • Distal sesamoidean ligaments: run from the sesamoid bones to the two pastern bones. (wikipedia.org)
  • spaces
  • In parallel to the main nasal passages, the horse has a complex system of paranasal sinuses - air filled spaces within the head which communicate with the respiratory tract, and serve to reduce the weight of the head. (wikipedia.org)
  • ostium
  • The results of experimental studies suggest that the natural ventilation-rate of a sinus with a single sinus ostium (opening), is extremely slow. (wikipedia.org)
  • The pressure differentials are directed to the center of the sinuses producing mucosal edema, transudation, and mucosal-or submucosal-hematoma, leading to further occlusion of the sinus ostium. (wikipedia.org)
  • The magnitude of the pressure difference needed to produce a barotrauma probably shows great individual variation and is related to the size of the sinus ostium and the rate of ambient pressure change. (wikipedia.org)
  • pairs
  • The sternum consists of multiple sternebrae, which fuse to form one bone, attached to the 8 "true" pairs of ribs, out of a total of 18. (wikipedia.org)
  • Fractures
  • Depressed fractures are usually comminuted, with broken portions of bone displaced inward-and may require surgical intervention to repair underlying tissue damage. (wikipedia.org)
  • meninges
  • verification needed] The confusion occurs in part because migraine involves activation of the trigeminal nerves, which innervate both the sinus region and the meninges surrounding the brain. (wikipedia.org)
  • marrow
  • Radiographically, the skeletal response to marrow proliferation consists of expansion of the medulla, thinning of cortical bone, and resorption of cancellous bone, which results in a generalized loss of bone density. (medscape.com)
  • New bone forms in response to marrow proliferation beneath the periosteum. (medscape.com)
  • These bones are composed of two thin layers of compact bone enclosing between them a variable quantity of cancellous bone, which is the location of red bone marrow. (wikipedia.org)
  • Since flat bones are usually thinner than the long bones, they only have red bone marrow, rather than both red and yellow bone marrow (yellow bone marrow being made up of mostly fat). (wikipedia.org)
  • The bone marrow fills the space in the ring of osteoblasts, and eventually fills the bony matrix. (wikipedia.org)