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 21 On the Scapuli

Cartilage peculiar to the joint of the clavicle with the upper process of the scapula

Often at this place there intervenes a special cartilage [articulatio acromioclavicularis, discus articularis], quite similar to the one which we stated is observed in joints of the lower with the upper maxilla. 71 This cartilage is smooth and slippery on both sides where it faces bones; it is held in place and in contact only with the ligaments surrounding the joint. The part of the process just mentioned (G, H in fig. 2) which originates from the dorsum of the scapula and is (so to speak) next to the dorsum, is opportunely named the spine; it is observed also in dogs (C, D in fig. 4), sheep, and horses. But the part (from H toward K in fig. 2) which goes away from the scapula forward to the outside and gradually broadens, can be observed only in humans, apes, squirrels, and any other animal that has a clavicle, that part we shall call the summus humerus [acromion], borrowing this name from the Greeks, who no doubt named the joint of the humerus with the scapula w=)moj, and called this part of the process a)krw/mion because it constitutes the upper surface of the joint and was considered, as it were, that joint’s safest bulwark. Certainly this is always what one learns from Hippocrates, often in other places and especially when he says that the humerus (which he himself calls the braxi/wn) is not dislocated upward 72


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(no doubt because the acromion obstructs it), and when he writes about fractures of the acromion. 73 But here Galen must be heeded as well, in his book De ossibus which states that the joint [articulatio arcomioclavicularis] of this process (Q [clavicle] to l [acromion] in the skeletons) with the clavicle is called the acromion by a number of professors of dissection.



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 21 On the Scapuli