Subscapularis Muscle Anatomy: Origin, Insertion, Action

Subscapularis Anatomy

Subscapularis Muscle

Origin: Medial two-thirds of volar surface of the scapula
Insertion: Lesser tubercle of the humerus
Actions: Internally rotates humerus
Innervation: Upper and Lower Subscapular Nerve (C5, C6)
Blood Supply: Subscapular artery from the axillary artery

Primary Actions of the Subscapularis

1. Internal rotation of the arm at the shoulder

Agonists:

Deltoid (anterior)
Pectoralis Major
Latissimus Dorsi
Teres Major

Antagonists:

Infraspinatus
Teres Minor
Deltoid (posterior)

If you are looking for pain and symptoms please visit the Subscapularis Pain Page

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Secondary Actions of the Subscapularis

1. Assists with depression of the humeral head

Agonists:

Infraspinatus
Teres Minor

Muscle Pain Information: The subscapularis muscle contributes to pain in the front and back of the shoulder, the upper arm, and wrist.

Recommended Muscle Anatomy Books

An excellent book for those beginning the study of anatomy. Coloring helps memory retention.

For intermediary anatomy students learning skeletal and muscle structure.

For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!