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Deltoid
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Deltoid:
Proximal Attachment - Lateral third of clavicle; acromion and spine of scapula
Distal Attachment - Deltoid tuberosity of humerus
Innervation - Axillary nerve
Action - Clavicular Part: flexes and medially rotates arm
Acromial Part: abducts arm
Spinal Part:extends and laterally rotates arm