. The anatomy of the human body. Human anatomy; Anatomy. 26 OSTEOLOGY. smaller than that of the lumbar vertebrae, and of which the transverse diameter begins to predominate. The spinous process is horizontal, strong, and quadrilateral. The transverse processes are represented by tubercles, which, like those of the preceding bone, are evidently continued in the lumbar region by those tubercles which we have denominated apophysary. Lastly, the body presents entire articular facettes. It is distinguished from the eleventh dorsal vertebra by the curved surface of the inferior articular processes.
. The anatomy of the human body. Human anatomy; Anatomy. 26 OSTEOLOGY. smaller than that of the lumbar vertebrae, and of which the transverse diameter begins to predominate. The spinous process is horizontal, strong, and quadrilateral. The transverse processes are represented by tubercles, which, like those of the preceding bone, are evidently continued in the lumbar region by those tubercles which we have denominated apophysary. Lastly, the body presents entire articular facettes. It is distinguished from the eleventh dorsal vertebra by the curved surface of the inferior articular processes. ^ Fifth Lumbar Vertebi'a. The inferior surface of the body slopes very obliquely downward and forward. The transverse processes vary in size, but are generally much larger than those of the other lumbar vertebrae ; the inferior articular processes, which are farther separated from each other, have a flat surface, and look directly forward. These are the only vertebrae which in each region present peculiarities. Excepting the first and second cervical, which have many characters quite foreign to the vertebrae of the region to which they belong, it might be said of those peculiar vertebra which have been specially described, that their peculiarities are comprehended in the general statement that those vertebra; which are placed at the limits of any two regions possess characters belonging to both regions. VertebrcB of the Sacro-coccygeal Region. All the vertebrae of this region, nine in number, are in the adult state united into two bones : the five superior form the sacrum, the four inferior the coccyx. The Sacrum (rf, e,figs. 1 and 8). The sacrum has received its name from the alleged practice of the ancients of offering this part of the victim in sacrifice. It occupies the posterior and median part of the pelvis, behind the point where this cavity articulates with the thigh bone, an arrange- ment advantageous for the erect position. It is inserted, hke a wedge, between the two
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