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

Spines of the sacrum

These intervals between the spines of the sacrum (d, d, d in fig. 2) sometimes appear continuous and uninterrupted [crista sacralis mediana] by any foramina, almost as in dogs. But in fact the bones of the sacrum do have spines, taller as the bones from which they grow are higher and larger. But no spine (so far as I can judge) angles the least bit upward: they all face downward, and as in the other vertebrae they create a certain interval [facies dorsalis] with the transverse processes, a place where several muscles [m. erector spinae] that move the back (10th table of muscles, and in subsequent tables as far as 14 in this part of the back) are appropriately located, and whence they best originate with other muscles 39 that go forth from this point.



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