(Chapter 25) Footnote 36:

“Nature has placed an upright bone [os pisiforme] like a sort of rampart, directed straight inward, to protect the other parts in that region, especially the nerve [ramus palmaris nervi ulnaris] coming from the spinal cord and distributed through the inner parts of the hand.” ( De usu partium 3.134.3, adapted from May 1968, p. 137).