. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SKELETON. 629 (4) of the lateral mass of the sacral vertebra (n,fig. 448.), which causes the human anatomist to name this anterior nucleary appendage as the "peculiarity" of sacral .form. This anterior nucleus of the sacral lateral mass, I call a rudimentary rib abutting against the iliac bone. PROP. X. The coccygeal vertebras are de- prived of their costal appendages. — The serial order in which we find all spinal figures standing, renders it, under comparison, a de- monstrable fact, that the coccygea! bones (
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SKELETON. 629 (4) of the lateral mass of the sacral vertebra (n,fig. 448.), which causes the human anatomist to name this anterior nucleary appendage as the "peculiarity" of sacral .form. This anterior nucleus of the sacral lateral mass, I call a rudimentary rib abutting against the iliac bone. PROP. X. The coccygeal vertebras are de- prived of their costal appendages. — The serial order in which we find all spinal figures standing, renders it, under comparison, a de- monstrable fact, that the coccygea! bones (B)t/zg. 449.) are the debris or metamorphosed Fig. 449. X,3 remains of true and complete vertebrae, such as A of the thorax. It matters not as an ob- jection to the truth of this idea of coccygeal bones being the minus proportionals of full costo-vertebral quantities, that we now find them wanting many of those elemental pieces which are existing to these latter. For though it be true that it is impossible now to read the same number of elements in the last caudal ossicle (B) which we find elsewhere posited for all other vertebrae of the spinal series, yet I hold it to be also impossible for any ana- tomist to contemplate the presential character of a caudal bone and remain unproductive of the idea that the caudal bone (B), as a cen- trum (5), is a proportional left standing after the metamorphosis of all its other parts. If, then, we agree to this, we must also agree to the fact that those very parts (1, 2, 3, 4, of A) which a caudal centrum (such as B) wants, are identical with those same parts which are left standing to other vertebrae. Now, when I find that a coccygeal ossicle (B, 5) holds series with the centra (5) of all other vertebra?, I have every reason to name it as being the centrum of its own vertebra, which has under- gone metamorphosis ; and therefore I may conclude that the plus original of the caudal ossicle (B, Jig. 449.) is equal to A, or to any other vert
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