Posts Tagged ‘Vertebra’
Thursday, March 4th, 2010
The vertebrae are the first bones encountered beyond the skull. The first vertebra is the atlas, so named because it must bear the skull. The second bone is the axis, the pivot point which allows free movement of the head and neck. The hyoid apparatus is in the throat, roughly beneath and in front of these first vertebrae. It may be connected with a vertebra, or it may be a free unit. It protects the windpipe.
The body of the vertebra is called a centrum; the space between centra is the intercentrum. The vertebral centra may be one of two types, either amphicoelous (biconcave) or procoelus (concave anteriorly, convex posteriorly). The backbone runs the entire length of the tail, but should this member be lost, the replacement will be forever devoid of true vertebrae. Along the tail section, when true vertebrae are present, one can locate the plane of autotomy, which is usually a cartilaginous plate before or behind the transverse process of the vertebra.
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Tags: Atlas, Auto Financing, Autotomy, Axis, Backbone, Bones, Centrum, Hyoid Apparatus, Pivot Point, Skeleton, Skull, Transverse Process, Vertebra, Vertebrae, Windpipe, Winnipeg
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Monday, March 1st, 2010
Above the ocular cavity is a bone or pair of bones called the frontals. This is a centrally located bone met anteriorly by the nasals or occasionally the prefrontal. It is bordered posteriorly by the parietal. Along the border of the frontal and parietal, or often in the center of the parietal, may be found a single round hole. It is in this small aperture that the pineal gland or third eye is located. In species lacking the eye, this pineal foramen is often absent.
There may be a temporal arch, an arch of bone created by the postorbital and squamosal bones. The lower arch, formed by an extension of the jugal with the quadrate, is not found in lizards, but does occur in the tuatara, Sphenodon, a lizard-like animal of New Zealand. In some lizards and all snakes the upper temporal arch is lacking; in these forms the squamosal bone is rudimentary or absent.
One last aspect of the skull that should be mentioned is the occipital condyle, the point where the cranium is fixed to the skull. This is a point of bone (single in lizards and the other reptiles) where the first vertebra, the atlas, attaches to the skull. It is not always at the hindmost part of the skull.
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Tags: Anatomy, Aperture, Auto Financing, Cavity, Cranium, Foramen, Jugal, lizard, Lizards, Nasals, Occipital Condyle, Parietal, Pineal Gland, Quadrate, reptiles, Skull, Snakes, Temporal Arch, Third Eye, Tuatara, Vertebra
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Wednesday, January 14th, 2009
The vertebrae are the first bones encountered beyond the skull areas. The first vertebrae is the atlas, so named because it must bear the skull. The second bone is the axis , the pivot point which allows free movement of the head and neck areas. The hyoid apparatus in the throatal areas , roughly behind an in front of these first vertebrae, or it may be a free unit – free standing so to speak. It protects the windpipe.
The body of the vertebrae is called a “centrum ; the space between centra is the intercentrum. The vertebral centra may be one of two types , either amphicouelous ( biconcave) or procoelus ( concave anterior , convex posterior). The backbone runs the entire length of the tail, but should this member be lost. the replacement will forever be devoid of true vertebrae. Along the rail section , when true vertebrae are present. one can locate the plane of autonomy, which is usually a cartilaginous plate before or behind the transverse process of the vertebra.
The forelimbs are supported from the pectoral girdle. The humerus bone articulates at a point between the sternum and interscapula. Similarly the femur fits into an opening of the ischium. At the lowest point of the pectoral girdle is the sternum , a bone which protects a good part of the internal organs. Between the sternum and the pelvis may be a bony or cartilaginous union of the ribs, known as the parasternum. Extending from beneath the scapula and uniting with the sternum is the clavicle , a bone always present in pairs.
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Tags: Auto Finance, Autonomy, Axis, Backbone, Clavicle, Edmonton Canada, Edmonton Job, Femur, Finance Www, Humerus Bone, Internal Organs, Ischium, Manitoba Canada, Neck Areas, Pectoral Girdle, Pelvis, Pivot Point, Ribs, Scapula, Skull, Sternum, Transverse Process, Vertebra, Vertebrae, Western Canada, Windpipe, Winnipeg
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