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 19 On the Bones of the Thorax

The number of ribs

It will now be timely to describe the bones of the thorax in order, and since we have already described its vertebrae (C to D in the fig. for ch. 14 and the figs. in ch. 16), to begin our account with the ribs. Men and women have twelve ribs on either side (numbered 1-12 in figs. 1 and 2); occasionally, there are only eleven, though sometimes we have even observed thirteen. 36 We reported above that thirteen thoracic vertebrae occur more often than only eleven. Each thoracic vertebra is articulated to a single rib on each side.



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 19 On the Bones of the Thorax