Where does the teres major muscle insert?

The teres major muscle inserts on the bicipital groove of the humerus, which is a significant anatomical landmark for muscles of the upper arm. This insertion point allows the teres major to play a crucial role in the internal rotation, adduction, and extension of the humerus.

Understanding the function of the teres major in relation to its insertion site helps illustrate its importance in upper body movements. The bicipital groove provides a connection point for not only the teres major but also for other muscles such as the latissimus dorsi and the pectoralis major, facilitating coordinated movements during activities like lifting or pulling.

The other options, while related to scapular anatomy, do not accurately represent the insertion site of the teres major. The medial scapula serves as an origin point for various muscles, the acromion process is involved in the stabilization of the shoulder joint but does not relate to the teres major, and the spine of the scapula is primarily where muscles like the trapezius and deltoid attach, not the teres major. Understanding the correct anatomical relationships is essential for effective sports massage practice and injury prevention in athletes.