Origin Lateral third of clavicle, acromion, and spine of scapula
Insertion Deltoid tuberosity of humerus
Action Anterior part: flexes and medially rotates arm; Middle part: abducts arm; Posterior part: extends and laterally rotates arm
Innervation Axillary nerve (C5 and C6) (C5, C6)
Arterial Supply Deltoid branch of thoracoacromial artery


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