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The deltoid muscle is located on the outer aspect of the shoulder and is recognized by its triangular shape. The deltoid muscle was named after the Greek letter Delta due to the similar shape they both share. The deltoid muscle is constructed with three main sets of fibers: anterior, middle, and posterior.
The biceps brachii muscle splits into two tendons at the shoulder: the long head and the short head. The long head of the biceps muscle assists other muscles with shoulder flexion. It is located in the front of the upper arm and attaches to the glenoid fossa, or socket part of the shoulder joint.The long head of the biceps muscle is innervated by the musculocutaneous nerve.he deltoid muscle is composed of three parts: anterior, middle and posterior. The anterior deltoid muscle is located on top of the shoulder and originates on the collarbone. The anterior deltoid tendon attaches to the front of the humerus producing shoulder flexion.