Archive image from page 639 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 618 ABNORMAL CONDITIONS OF THE SHOULDER JOINT. also slightly adductecl towards the middle line. When the shoulder is viewed posteriorly a depression corresponding to the situation of the posterior half of the glenoid cavity is observable : into this depression the ringer can be sunk so far as to reach the surface of the posterior part of the glenoid cavity. When the arm is drawn forwards across the chest, the head of the humerus passes backwards beneath the
Archive image from page 639 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 618 ABNORMAL CONDITIONS OF THE SHOULDER JOINT. also slightly adductecl towards the middle line. When the shoulder is viewed posteriorly a depression corresponding to the situation of the posterior half of the glenoid cavity is observable : into this depression the ringer can be sunk so far as to reach the surface of the posterior part of the glenoid cavity. When the arm is drawn forwards across the chest, the head of the humerus passes backwards beneath the acromion, and a depression can be felt in front beneath the coracoid process, corresponding to the portion of the abnormal articular cavity which the head of the humerus had just before occupied. The muscles of the region of the shoulder are very imperfectly developed, but those of the fore-arm and Fie. 441. Case of M. H.— Congenital malformation of the left shoulder joint, with luxation of the head of the humerus inwards. hand seem of their normal size. The patient has but little power of moving the affected upper extremity. The trapezius muscle of this side is well formed, therefore he can by means of its influence elevate on the side of the trunk the whole limb. The deltoid and capsular muscles are very imperfectly formed, and consequently the patient has no power of abduction, nor of rotation, of the humerus. The shoulder has not the usual rounded form, but still it does not present the flattened ap- pearance, nor the acromion the angular out- line which characterises the accidental luxa- tion of this joint. Yet the acromion process does project somewhat, and when the arm hangs by the side, the head of the humerus, distinct and prominent, is removed so much from the under surface of the acromion, as it were by the weight of the limb, that the thumb can be easily placed between them. When we take hold of the elbow and raise the arm vertically, the joint assumes more o
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