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Middle Deltoid
Orgin: Lateral Acromion
Incertion: Deltoid tuberosity of humerus
Action: abduction of humerus to 90 degrees
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
