Muscle Atlas


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)
Arterial Supply: Deltoid branch of thoracoacromial artery

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