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

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)

Advertisement




Secondary Actions of the Subscapularis

1. Assists with depression of the humeral head

  Agonists:

  • Infraspinatus
  • Teres Minor