. Atlas and epitome of traumatic . ) F; Heichhold, Munclicn. FBACTUEES OF THE UPPER EXTEE3IITY. 141. with the scapula; the region corresponding to the tuber-osities and the surgical neck (if the force continues to act)are pressed against the upper border of the glenoid fossa andthe acromion. Theseconstitute a fulcrum,and the short armof the lever—i. e., thehead of the humerus—is pried out of its nor-mal position, tearingthe capsule. A dislo-cation produced in thisway generally presentsthe character of adownward or infra-glenoid dislocation,which by a secondarydisplacement of thehumer
. Atlas and epitome of traumatic . ) F; Heichhold, Munclicn. FBACTUEES OF THE UPPER EXTEE3IITY. 141. with the scapula; the region corresponding to the tuber-osities and the surgical neck (if the force continues to act)are pressed against the upper border of the glenoid fossa andthe acromion. Theseconstitute a fulcrum,and the short armof the lever—i. e., thehead of the humerus—is pried out of its nor-mal position, tearingthe capsule. A dislo-cation produced in thisway generally presentsthe character of adownward or infra-glenoid dislocation,which by a secondarydisplacement of thehumerus under the ac-tion of the muscles isconverted into a sub-coracoid regards the ana-tomic relations in asubcoracoid disloca-tion, the head of thehumerus is found inclose contact with theedge of the glenoid cavity, between it and the thorax (see Fig. 47), and mayexert pressure on the large vessels and nerves. The symptoms of a typical subcoracoid luxation arevery characteristic (see Plate 27). They are due to thefact that the head of the humerus is absent from its nor-mal position and oc
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