Page 62 - ASOP ROT Study Guide

.

The remainder of the stability of the shoulder girdle is due to large muscles from the chest wall and
neck which suspend the clavicle and scapula (illustrated above). In particular the trapezius
muscle suspends the clavicle and scapula and the serratus anterior secures the scapula to the
chest wall.

9. THE SHOULDER JOINT

9 . 1 General Structure

The shoulder joint is a synovial joint of the ball and socket type. Unlike the hip joint though, the
ball and socket of the shoulder joint are much less fully developed and more resemble an egg sitting
on a spoon. The articular surface of the scapula is called the glenoid fossa (Figure 28). This is
shallow but has a thick cartilaginous rim called the labrum which helps to further enclose the head
of the humerus. The joint is surrounded by a capsule and most importantly by the rotator cuff
(illustrated below).

www.frozenshoulderclinic.com www.eorthopod.com