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Anterior Deltoid

Orgin: Lateral third of Cervical

Incertion: Deltoid tuberosity of humerus

Action: Flexion

 Horizontal adduction

Medial rotation of humerus

Nerve: Axillary nerve (Circumflex) (Cervial 5, 6)

Palpate: Anterior-medial surface of upper arm below acromion process, just anterior to glenohumeral joint during active flexion of humerus

This muscle forms the rounded muscle bulk over the shoulder joint. It is a strong abductor, but cannot initiate that movement because the angle of pull is parallel to the humerus when the arm is by the side. See Supraspinatus