Deltoid (Lateral)

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Other Names Shoulder (Side) Side Delts Heads Lateral Deltoid (1 of 3 Deltoids) Also see Anterior Deltoid Posterior Deltoid Movement Shoulder Abduction Flexion Transverse Abduction Attachments Origin Scapula Acromion (Lateral) Insertion Humerus (Lateral) Deltoid Tuberosity Comments The lateral deltoid is involved in shoulder abduction when the shoulder is internally rotated. It is involved in shoulder flexion when the shoulder is internally rotated. It is involved in shoulder transverse abduction (shoulder externally rotated) but is not utilized significantly during strict transverse extension (shoulder internally rotated).