PinkMonkey Online Study Guide-Biology
Click Here To Enlarge
Figure 20.3 Vertebral column
All the vertebrae are constructed with the same basic
structure (Fig. 20.4) and have two parts: (i) the body or
centrum (i.e. the anterior or ventral part) and ; (ii) the neural
arch (i.e. the posterior or dorsal part). The vertebral canal
lies between the body and arch, and encloses the spinal cord. The arch
bears three processes for attachment of muscles; two transverse processes,
one on either side that articulates with ribs, and a spinous process
which projects dorsally to which muscles and ligaments are attached.
The arch also bears articular processes-(two superior and two inferior)
which project rostrally and caudaully respectively. These processes articulate
with each other on adjacent vertebrae. Between the successive vertebrae
are a pair of small openings called intervertebral foramina
for the passage of spinal nerves. Between each of the vertebrae are
cartilaginous pads; the intervertebral discs.
The vertebrae are named according to the region in which
they lie (i) Cervical-7, (ii) Thoracic-12 (iii) Lumbar-5 (iv) Sacral-5,
fused into one sacrum and (v) Coccyl-4, fused into one: the Coccyx.
Table of Contents
All Contents Copyright © PinkMonkey.com
All rights reserved. Further Distribution Is Strictly Prohibited.
This page was last updated: 5/9/2017 8:55:33 AM