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 22 On the Clavicles

The use of curvature 15

None of this was done idly or in vain by the Maker of things; for where the clavicle faces the throat, it is rightly concave on its posterior or interior side, as 16 the rough artery [trachea], the esophagus with the nerves of the sixth pair of cerebral nerves, 17 and especially the noteworthy series of nerves 18 going from the dorsal medulla to the axilla, need to pass this way. 19 For these nerves especially the clavicle provides a path, and it is placed before them like a bulwark. Because the clavicle extends to the posterior from the throat, or rather from the middle of its own length, and did not for any purpose need to be convex on its anterior surface, it necessarily curves forward again next to the upper process [acromion] of the scapula until it reaches the part of that process (L in figure 1, chapter 21) to which it can fitly be articulated. Here it extends forward as much as it had diverged backward 20 in the protruding part [tuberculum conoideum] (O in figures 2 and 3) of its posterior surface, which is not far from the acromion.



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 22 On the Clavicles