. A practical treatise on fractures and dislocations. ened portions of thecapsule in different positions of the the outer and anterior portion of theupper end of the humerus is the greatertuberosity, bounded internally in front bythe bicipital groove which lodges the longtendon of the biceps and has upon its innerside the lesser tuberosity. Between theupper margins of these tuberosities and theglobular articular head is a shallow groove,the anatomical neck. The acromion and coracoid processes lieabove, the one on the outer, the other onthe inner side, and the strong coraco-acro-mial li
. A practical treatise on fractures and dislocations. ened portions of thecapsule in different positions of the the outer and anterior portion of theupper end of the humerus is the greatertuberosity, bounded internally in front bythe bicipital groove which lodges the longtendon of the biceps and has upon its innerside the lesser tuberosity. Between theupper margins of these tuberosities and theglobular articular head is a shallow groove,the anatomical neck. The acromion and coracoid processes lieabove, the one on the outer, the other onthe inner side, and the strong coraco-acro-mial ligament uniting them closes in theupper part of the joint, but is separatedfrom its cavity, as are also the two pro-cesses, by the interposed capsule and thetendon of the supraspinatus. The surface of the head of the humerusthat is covered by articular cartilage isabout one-third of that of a sphere, and theaxis passing through its centre meets the long axis of the shaft at anangle of about 130 degrees. The linear extent of the glenoid fossa, 547 Acr. To show the relations of the hu-merus and scapula. X, the lessertuberosity. F and S indicate thefrontal and sagittal planes. 548 DISLOCATIONS. including its fibro-cartilaginous rim, on a horizontal section is less thanhalf as great as that of the head of the humerus; on a vertical sectionit is about two-thirds as great. The head of the humerus, therefore,simply rests against the fossa, and its displacement is but slightlyopposed by the conditions of contact between them. The muscleswhich are most closely associated with the joint are the supraspinatus,infraspinatus, and teres minor, attached to the greater tuberosity inthe order named from above downward, and the subscapularis, which,arising from almost the whole of the costal surface of the scapula,passes forward, broadly covering the inner side of the joint with itsfibres and tendon, to be attached to the lesser tuberosity. The tendonof the long head of the biceps, starting from
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