|Insertion||Lesser tuberosity of Humerus|
|Nerve supply||Upper and lower subscapular nerves|
|Actions||Medial rotation of the arm|
Subscapularis Origin and Insertions – Image modified from BodyParts3D, © The Database Center for Life Science licensed under CC Attribution-Share Alike 2.1 Japan
“Sub” means under or below. Subscapularis is located underneath the Scapula as the name suggests.
When this muscle contracts, the Humerus head is pulled medially resulting in rotation. This also helps maintain the humeral head latched on to glenoid cavity, assisting in joint stability.
Check previous lesson for Sternoclavicular joint and Acromioclavicular joint and Next lesson for Teres Major muscle.