KP221 Lecture Notes - Lecture 21: Intervertebral Foramina, Cervical Vertebrae, Intervertebral Disc

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Intervertebral discs lie between adjacent vertebrae: water filled, absorbs stock, deflates in size when no gravity, why taller after sleep vs. during day. Typical vertebra: all features that are dominant, neural and spinal development occur together, spine starts off with 3 body a(cid:374)d (cid:1006) la(cid:373)i(cid:374)ae that for(cid:373) a (cid:858)roof(cid:859) to prote(cid:272)t spi(cid:374)al cord; the rest is calcification. Inferior vertebral notch and superior vertebral notch of lower pedicle form intervertebral foramen: spinal nerve exits from vertebral canal. Inferior articular processes face forward and downward (45o angle: get increasingly larger caudally, c7 transition between cervical and thoracic, spi(cid:374)ous pro(cid:272)ess is(cid:374)(cid:859)t as pro(cid:373)i(cid:374)e(cid:374)t u(cid:374)til c5-7. Atlas and axis: 2 specific cervical vertebrae with distinct names, atlas (c1) = supports & articulates with head; never moves independent of head, superior articular facets are concave and articulate with occipital condyles of skull. 33 vertebrae: 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, 4 coccyx: supports trunk and protects spinal cord.

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