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

There are most often twelve thoracic vertebrae.

The vertebrae of the thorax are numbered twelve (C-D in the fig. in ch. 14; K to L in the skeletons; see also the whole structure 9 of vertebrae in figs. 1 and 2, ch. 19), though sometimes, albeit rarely, one is missing or there is an extra. But it is found that one is missing more rarely than one is in excess. 10 At Padua I found two bodies 11 with thirteen thoracic vertebrae, but so far I have never seen only eleven vertebrae. The number of cervical and lumbar vertebrae is not varied as often as that of the thorax. 12 Furthermore, even though thoracic vertebrae are made up of a constant number, they do not display the same type of articulation in all.



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