Anatomy Odyssey

So a break from our previous focus on the abdomen - a brief detour into the world of the rotator cuff muscles, but first - what are they? http://human-anatomy101.com/anatomy-of-the-hand-muscles/ Rotator cuff muscles are basically the muscles which surround and support the shoulder joint. The shoulder joint is also known as the glenohumeral joint, and is a synovial ball and socket joint  between the glenoid fossa of the scapula (a shallow hollow in the scapula) and the head of the humerus. The joint is deppened by a lip around the glenoid fossa - the glenoid labrum. It is surrounded by a capsule which attaches to the anatomical neck of the humerus, and is lax underneath where it descends to the surgical neck of the humerus. I found the rotator cuff muscles a bit difficult to conceptualise when I first learnt about them, but actually they are quite simple when you apply five simple rules. Rule 1: There are four rotator cuff muscles. These  can be remembered with the acronym