Muscles Acting on the Arm

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Last updated 1:02 PM on 4/6/26
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4 Terms

1
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Pectoralis Major

Origin: clavicle, sternum, cartilage of ribs; Insertion: intertubercular sulcus of humerus; Function: prime mover of arm flexion, rotates arm medially and adducts arm.

2
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Latissimus Dorsi

Origin: spinous process of thoracic vertebrae, lumbar vertebrae, ribs, and iliac crest; Insertion: intertubercular sulcus of humerus; Function: prime mover of arm extension, adducts and medially rotates.

3
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Deltoid

Origin: clavicle, acromion and spine of scapula; Insertion: deltoid tuberosity of humerus; Function: prime mover of arm abduction.

4
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Teres Major

Origin: inferior angle of scapula; Insertion: intertubercular sulcus of humerus; Function: synergist to latissimus dorsi.