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CHP8 The Skeletal System

Btw vertebraeeach vert contributes ribs articulating

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Unformatted text preview: Spinous process present, bifid in C2-C6 for nuchal ligament bifid attachment attachment • C3-C6 similar to typical vertebrae • C7 differs since the spinous process is not bifid & is long… forming bump of lower neck (vertebra prominens) • C3-C7 have transverse foramina= passage for vertebral C3-C7 transverse passage arteries to brain arteries Thoracic & Lumbar Vertebrae Thoracic Thoracic (T1-T12)= 12 prs of ribs attach to 12 thoracic vert’s • Lack transverse foramina & bifid processes • Spinous processes angled down & pointed; body larger than Spinous cervical; costal facets cervical; • Ribs insert btw vertebrae…each vert contributes ½ Ribs articulating surface (inferior & superior costal facets) articulating • T1, T10-T12 articulate w/ body T1, • T11-T12 have no transverse costal facet (2nd pt of articulation) Lumbar (L1-L5)= thick, stout body w/ blunt, squarish spinous Lumbar thick, process process • Superior articular processes face medially (not forward), inferior a.p. face laterally…so lumbar region resists twisting inferior • L1 is in transition btw thoracic & lumbar, so s.a.p. faces dorsally L1 & i.a.p. laterally i.a.p. Cervical C1 Thoracic C2 Lumbar Sacrum Sacrum= bony plate of dorsal wall of pelvic cavity; S1-S5 bony in kids fuse ~16 yrs, completed by ~26 in • Features to know: ala, sacral canal, body, sacral foramina, Features transverse lines transverse • Anterior surface of body is smooth & concave w...
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