Page 64 - ASOP ROT Study Guide

This forms a "roof" to the shoulder and helps to prevent the head of the humerus slipping out of the
top of the glenoid fossa. The other ligaments of the capsule are not particularly strong and
consequently the shoulder is more likely to dislocate in other directions.
The rotator cuff: this group of four muscles arises from the broad flat areas of the scapula and
comes together to insert beyond the head of the humerus. They thus form a cuff of tissue like
the fingers of a hand cupping a ball. The rotator cuff is an important adjunct to stability but
also contributes to moving the shoulder joint. The muscles of the rotator cuff are
subscapularis, infraspinatus, supraspinous and teres minor (illustrated below).

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