. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. STRUCTURE OF VERTEBRA. 351. by different physiologists; but the following are more parti- cularly recognised as being en- titled to that character. They are represented in their relative situations in Fig. 180. The first is the part which forms the nu- cleus, or body (b) of the vertebra; and its ossification begins at the centre. Next in importance are the two bony plates, or leaves^ as they may be called (l, l), which proceed from the sides of the body, and
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. STRUCTURE OF VERTEBRA. 351. by different physiologists; but the following are more parti- cularly recognised as being en- titled to that character. They are represented in their relative situations in Fig. 180. The first is the part which forms the nu- cleus, or body (b) of the vertebra; and its ossification begins at the centre. Next in importance are the two bony plates, or leaves^ as they may be called (l, l), which proceed from the sides of the body, and em- brace the spinal marrow which is situated between them. The fourth essential element is the spinous process (s), which unites the two leaves, and thus completes the superior arch, of which it may be re- garded as the key stone, for the protection of the spinal marrow. Then come the two transverse pro- cesses (t, t), which extend outwards from the sides, and with which the arches of bone, constituting the ribs (r, r), are generally connected. These are the six parts which have been considered as the ele- ments that are most essential, and most constantly present in the composition of the vertebree. But some other parts may also be noticed as of very frequent occurrence : such are the bony plates which cover the two flat portions of the bodies of the vertebrae, forming the surfaces immediately contiguous to the intervertebral ligament; w hich surfaces, in some of the lower orders of the verte- brata, become articular. There is frequently, also, a developement of processes (i), forming arches and spines at the lower surface of the vertebra^, or. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering
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