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

Number of processes of the thoracic vertebrae

Since these things are so, all the thoracic vertebrae have seven processes: two transverse (H, I in figs. 1-4), two ascending (T, V in fig. 1, X, Y in figs. 2 and 3), two descending (a, b in figs. 2 and 3), and one posterior process or spine (N, O, P in figs. 1 and 2). 66 If the eleventh or some higher vertebra is supported on both ends, the twelfth or all the vertebrae below the one supported on both ends would have two extra processes, since each of the ascending processes would be counted as two on account of the depression [fovea] carved in them. This depression (in fig. 2 ch. 17 the depression is labeled K, the swelling M, L) 67 was thought by some ancient authors to be so pronounced that they seem to have counted each ascending process of the lumbar vertebrae as two.


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But now it will be preferable to devote a special chapter to those vertebrae as well, and to describe them more fully there.



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