Shoulder Building 101: Time to Build Those Boulders
Let’s start off by explaining the anatomy of the shoulder. It’s not very complicated and not much to it. Once you understand how these muscles work, you will find it easier to visualize during your delt workouts.
Let’s Discuss the Anatomy of the Shoulder
The shoulder is the most movable joint in the body but is very unstable. The joint itself is considered a ball and socket. The ball of the shoulder is the head of the humerus. The socket portion is called the glenoid (where arthritis can form).
On top of the ball and socket is a process called the acromion (where bone spurs can form). Next to the acromion is the acromioclavicular joint, also called the AC Joint (this is a common place for separations). This ball and socket joint allows for the most range of motion out of all the joints in the body.
The roundness that you see at your shoulder is actually made up of 3 separate muscles or “heads”. These heads are the anterior, middle, and posterior deltoids. The deltoid is a pinnate muscle, which is where the muscle with fascicles attaches obliquely to its tendon. This allows better force production and stabilization but you lose flexibility.
Chapter 2: Different Parts Of The Delts
Anterior Deltoid
The anterior deltoid originates on the clavicle and inserts onto the deltoid tuberosity of the humerus. The main job of the anterior deltoid is abduction when the shoulder is externally rotated, but it also assists with transverse flexion but it is not a strong movement for this part of the deltoid.
Middle Deltoid
The middle deltoid originates on the acromion and inserts onto the deltoid tuberosity of the humerus. The purpose of the middle deltoid is shoulder abduction when the shoulder is internally rotated and also assists in transverse abduction.
Posterior Deltoid
The posterior deltoid originates on the spine of the scapula and inserts onto the deltoid tuberosity of the humerus. The posterior deltoid aids in shoulder extension, external rotation, transverse abduction and also transverse extension.
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