The subscapularis is an intrinsic muscle of the shoulder region. This muscle is part of a larger muscle group known as the rotator cuff muscles, which play an important role in providing stability for the shoulder joint (Fig 1).
Regarding muscle origins, the subscapularis muscle begins at the subscapular fossa, which is located on the anterior surface of the scapula. From there, it attaches to the lesser tubercle of the humerus.
With regard to muscle actions, the subscapularis is known for its role in mediating the medial rotation of the arm.
In terms of innervation, the subscapularis muscle is primarily supplied by both the upper and lower subscapular nerves.
Finally, for blood supply, the subscapularis is nourished primarily by the subscapular artery.
In summary, the subscapularis is an important shoulder region muscle that plays an important role in medial rotation of the arm. Its origins are at the subscapular fossa, it is innervated by both the upper and lower subscapular nerves, and it is nourished by the subscapular artery.
