Muscle Anatomy of the Anterior Deltoid. The deltoid consists three sets of fibers: anterior, middle, and posterior. This chart describes these points of origin. The anterior deltoid is involved in shoulder abducted when the shoulder is externally rotated. Origin & Insertion Since the deltoid muscle is divided into three different sections, this muscle has multiple points of origin. 1 ORIGIN Lateral third of clavicle, acromion, spine of scapula to deltoid tubercle : INSERTION Middle of lateral surface of humerus (deltoid tuberosity) ACTION Abducts arm, anterior fibers flex and medial rotate, posterior fibers extend and lateral rotate : NERVE Axillary nerve (C5, 6) (from posterior cord) Deltoid Muscle - Anterior and Middle Heads The Deltoid muscle (derived its name from the Greek letter delta) is a large, triangular muscle occupying the upper arm and the shoulder giving it this rounded shape. Origin: Anterior border of the lateral third of the clavicle Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft Actions: Flexion and internal rotation of the arm at the shoulder Innervation: Axillary nerve (C5, C6) Blood Supply: Posterior humeral circumflex The anterior deltoid is only a weak synergist in strict transverse flexion, assisting the pectoralis major, but not transverse adduction, meaning the shoulder needs to be internally rotated to be recruited in the transverse plane.
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