What is the insertion point of the subscapularis muscle?

The insertion point of the subscapularis muscle is at the lesser tubercle of the humerus. This muscle is one of the four rotator cuff muscles and plays a crucial role in shoulder stability and movement. Its primary function includes internal rotation of the shoulder joint. The anatomical positioning at the lesser tubercle allows the subscapularis to exert its effects efficiently on the humerus during movements such as reaching and lifting.

The other options represent different anatomical landmarks that are not directly related to the subscapularis. For instance, the greater tubercle serves as an insertion point for other rotator cuff muscles, while the lateral olecranon process and the lateral shaft of the radius pertain to structures involved in the elbow joint, which is distinct from the shoulder and the functions of the subscapularis. Understanding the correct anatomical insertions is essential for applied anatomy in sports massage, as it helps in targeting specific muscles during treatment and rehabilitation.