What is the role of the lesser tubercle in relation to muscle attachment?

The lesser tubercle of the humerus primarily serves as the insertion point for the subscapularis muscle. This muscle is one of the rotator cuff muscles and is crucial for shoulder internal rotation. The location of the lesser tubercle facilitates this function by providing a stable attachment point, allowing the subscapularis to exert its force effectively during arm movements.

Understanding the anatomy and function of muscles relative to their bony attachments is essential in orthopedic practice. The subscapularis not only plays a key role in shoulder stability but also assists in various activities that require internal rotation of the shoulder. This anatomical relationship highlights the importance of the lesser tubercle in shoulder mechanics and muscle function.