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 18 On the Sacral Bone and the Coccyx

The nature of the anterior and posterior areas of the sacrum

The entire posterior of the sacrum is convex and curved so as more safely to protect as a bulwark the parts which it shelters and to guard them from impacts. On the anterior is it smooth, not rough, but flat and concave, the better to form a place for those organs which it encloses together with the other bones [ossa coxae] like a kind of basin. 40 This is how the human sacrum is arranged, sometimes made up of only five bones, in which case two foramina are missing in the anterior; but in the posterior a path is always seen for six pairs of nerves [segmenta medullae spinalis, pars sacralis].



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 18 On the Sacral Bone and the Coccyx