Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 16 On the Vertebrae of the Thorax

How the lumbar vertebrae are articulated with each other

The lumbar vertebrae are joined according to a different system. Their ascending processes [p. articularis superior] (K, L, and M in fig. 2, ch. 17) have an elongated and rather deep 54 depression [fovea] on the inner side where they face each other. The descending processes [p. articularis inferior] protrude with a long 55 capitulum on their outer side (but somewhat toward the anterior); this fits into the depression of the lower vertebra’s ascending process. Thus in the lumbar vertebrae the lower vertebra admits the capitula of the one above in its depressions, unlike the neck and thorax, where the upper vertebra receives the projections 56 of the lower one into its depressions. The twelfth thoracic vertebra has ascending processes (e, f in fig. 4) like those of the cervical and thoracic vertebrae 57 which we have said protrude on the posterior surface. Therefore the twelfth goes up into the descending processes of the eleventh thoracic with its ascending processes, and is received by the eleventh. The descending processes of the twelfth (g, h in fig. 4) also protrude like the descending processes of the lumbar vertebrae, and these enter the depressions of the ascending processes of the first lumbar vertebra. Since it receives the twelfth, what could be easier to comprehend than that the twelfth is received above and below? 58



Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 16 On the Vertebrae of the Thorax