The Anatomy of the Shoulder (Part 1)

This is the first of a four part series on the guide and care of your shoulders.

Shoulder Guide
Your shoulders are incredibly flexible joints that allow your arms to move through a large range of motion. They are used in almost every activity and they take a lot of punishment on a daily basis. As a result, they are prone to a wide range of injuries. It’s important to take good care of your shoulders because even small problems can quickly become debilitating if not taken care of immediately.

The Anatomy Lesson
The shoulder is made up of three bones. The humerus is the big bone in your upper arm. The clavicle (collar bone) attaches to your rib cage at one end and helps keep your shoulder out to the side of your body. The scapula (shoulder blade) is the third bone. Part of the scapula, the acromion, juts out and forms a roof over the top of the joint. Another part of the scapula forms a socket into which the round head of the humerus fits.

The upper arm is held in its socket by loose ligaments and four small rotator cuff muscles that cover the joint like a sleeve. Other back, chest and upper arm muscles help support and move the shoulder.

There is also a fluid filled sac in the shoulder called a bursa. This bursa is like a cushion that helps prevent the tendons from rubbing against the bones.

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