skeleton of the back 6

skeleton of the back

.

lumbar vertebrae differ from thoracic vertebrae in the fol-

lowing ways (Fig. 1.05): lumbar vertebrae have larger bodis,

broad spinous process that project posteriorly, and they do not

have articular facets for ribs. On a skeleton, observe the lumbar

vertebrae and notice that their spins do not overlap like the

spines of thoracic vertebrae. [6 Z89; N 148; R 1%; C 426]

The sacrum is formed by five fused vertebrae and it does not

have identifiable spins or transverse process. On the dorsal

surface of the sacrum, identify (Fig. 1.06): [G Z93; N 150; ll ‘I87;

C418]

° Median sacral crest

° Posterior (dorsal) sacral foramina

' Sacral hiatus

The ooecyx is a small triangular bone formed by four rudi-

mentary coocygeal vertebrae that are fused together (Fig. 1.06).

SKIN AND SUPERFICIAL FASCIA

Before you dissect . . .

The order of disection will be as follows: the skin will be

removed from the back, posterior surface of the neck, and pos-

terior surface of the proximal upper limb. Posterior cutaneous

nervs will be studied. The superficial fscia will then be

removed