human anatomy 2015 lecture four Dr meethak ali ahmed neurosurgeon
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1 The Vertebral Column the vertebral columnis central pillar of the body.it serve to protect the spinal cord and support the weight of the head trunk, which it transmits to the hip bones & the lower limbs. is the flexible structure made up of irregular bone called Vertebrae, separated by fiberocartilaginous discs called intervertebral disc. The intervertebra discs form one quarter of the length of the column. The vertebra are arranged in the following group Cervical (7), Thoracic (12), Lumbar (5), Sacral (5 fused to form the sacrum )and coccygeal (4 the lower 3 are commonly fused). General Characteristics of the vertebrae; A typical vertebra consist of a round body anteriorly & a vertebral arch posteriorly, these enclose a space called the vertebral foramen, through, which run the spinal cord & its covering. the vertebral arch consists of a pair of cylindrical pedicles, which form the sides of the arch, & a pair of flattened laminae, which complete the arch posteriorly. The spinous process, or spine,is directed posteriorly from the junction of the two laminae,. the transverse processes are directed laterally from junction of the laminae and pedicales. The articular processes are vertically arranged & consist of two superior & two inferior processes.they arise from the the junction of lamina and pedicales, & their articuler surfaces are covered with hyaline cartilage. The pedicale are noted on their upper & lower borders, forming the superior & inferior vertebral notches.the superior notch of one vertebrae & the inferior notch of an adjacent vertebra together form an intervertebral foramen. Cervical Vertebrae A typical cervical vertebrae has following characteristic ;1- Each transverse processes a foramen tranversarium for the vertebral vessels (note that the vertebral artery passes through transverse processes c1-c6 & not through c7). 2- The spines are small & bifid.3- The body is small &
2 broader from side to side than from front to back ; there are small synovial joints on each side. 4- the vertebral foramen is large & triangular in shape.5- the superior articular processes have small, flat articular facet which face backward & upward ; the inferior articular processes have facet that face downward& forward. The first, second & seventh cervical vertebrae are atypical. The first cervical vertebra, or atlas, has no body & no spinous process.its merely a ring of bone consisting of anterior & posterior arches & a lateral mass on each side,each lateral mass has articular surface on aspects. The bone articulates above with the occipital its upper & lower condyles, forming the atlanto- occipital joint.below the bone articulate with the axis, forming the atlanto- axial joint. The second cervical vertebra or axis, has a peglik odontoid process, which surmounts the body & represents the body of the atlas, which has fused with the axis The seventh cervical vertebra, or vertebra prominens, is so named because it has the longest spinous process is not bifid, the transverse process is large, but the foramen transversarium is small and transmit the vertebral vein.
3 Thoracic Vertebrae 1- The thoracic vertebrae increase in size from above downward.2- The body is heart shaped.3- The vertebral foramen is relatively small & circular. 4- Costal facets are present on the side of the body where the heads of the ribs articulate, &on the transverse processes for articulation with the tubercles of the ribs. 5- The superior articular processes bear facets that face backward &laterally, while the facest on the inferior articular processes face medially.6- The inferior articular processes of the twelfth vertebra face laterally, as do those of the lumbar vertebrae. Lumbar Vertebrae 1-The body of each lumbar vertebra is massive & kidney shaped.2- The pedicles are strong & the directed backward,. 3- The laminae are thick, & the vertebral foramina are triangular in shape. 4- The transverse processes are long & slender.5- The spinous process is short, flat, & quadrangular in shape & project directly backward. 6- The articular surface of the superior articular processes face medially &
4 those of the inferior articular processes face laterally. 7- The lumbar vertebrae have no facets for articulation with ribs & no foramina in the transverse processes. Sacrum The sacrum consist of five rudimentary vertebrae fused together to form a wedge-shape bone. which is concave anteriorly.the superior border or base of the bone articulate with the fifth lumbar vertebra. The narrow inferior border articulate with coccyx.the vertebra foramina are present & form the sacral canal. The lamina of the fifth sacral vertebra, and sometime those of the fourth also,fail to meet in the midline, forming the sacral hiatus. Coccyx The coccyx consist of four vertebrae fused together to form asmall triangular bone, which articulates at its base with the lower end of the sacrum. the first coccygeal vertebrae commonly is not fused, or is
5 incompletely fused, with the second vertebra. Intervertebral discs The intervertebral discs are responsible for one-quarter of the length of the vertebral column.they are thickest in the cervical & lumbar region, where the movements of the vertebral column are greatest they may be regarded as semi-elastic disc, which lie between the rigid bodies of the adjacent vertebrae. Each disc consists of a peripheral part, the annulus fibrosus The annulus fibrosus is composed of fibrocartilage, in which the collagen fibers are arranged in concentric lamellae. the collagen bundles pass obliquely between adjacent vertebral bodies. the more peripheral fibers are strongly attached to the anterior & posterior longitudinal lingaments of the vertebral column. The nucleus pulposus in the child is an ovoid mass of gelatinous material containing a large amount of water, a small number of collagen fiber & few cartilage cells its normally under pressure & situated slightly nearer to the posterior than to the anterior margin of the disc.
Copyright 2010 Pearson Education, Inc.
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Copyright 2010 Pearson Education, Inc. Copyright 2010 Pearson Education, Inc. Figure Sectioned spinous process. Interspinous.
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