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Excerpt from The American Journal of the Medical Sciences, 1861, Vol. 42 The extreme mobility of the scapula would, at first thought, seem to be a circumstance of insecurity. It is, however, really quite the reverse, the ready yielding of the scapula defeating the effect of Violence exerted on the joint through the humerus. The facile motions of the scapula, efiected by its complicated muscular apparatus, enable it to present its shallow glenoid in almost every direction. When the arm is elevated, and sustains a force from above, the glenoid looks upward to Oppose it. When we fall upon the hand, laterally, the same cavity presents downward and outward. It is thus capable of almost instantly Opposing its surface to the head of the humerus, in Whatever attitude it may present itself thus revolving around it and really, in its mechanism, representing a much deeper cup than that which it exhibits in the skeleton. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.