Where does the Subscapularis muscle insert?

The Subscapularis muscle inserts at the lesser tubercle of the humerus. This insertion point is significant because it allows the muscle to play a crucial role in the internal rotation of the shoulder joint. The Subscapularis, being one of the four rotator cuff muscles, is specifically tasked with stabilizing the glenohumeral joint while facilitating movements such as reaching and lifting.

The lesser tubercle serves as the bony prominence where the muscle's tendon attaches, creating a lever arm that enhances the muscle's ability to exert force during movement. Understanding the anatomy of the Subscapularis and its insertion point is essential for those involved in orthopedic practices, as injuries to this muscle or its tendon can lead to shoulder instability or pain.