What is the distal attachment of the teres major muscle?

What is the distal attachment of the teres major muscle?

• A. Greater tubercle of the humerus
• B. Medial lip of the intertubercular groove of the humerus
• C. Deltoid tuberosity of the humerus
• D. Inferior angle of the scapula

Answer: (B)

The teres major muscle has its distal attachment at the medial lip of the intertubercular groove of the humerus. This anatomical feature is significant as the intertubercular groove serves as a conduit for tendons of the shoulder muscles and allows for the muscle to contribute to the movements of the shoulder joint, such as adduction and medial rotation of the arm. By attaching to this specific area, the teres major plays an integral role in the stability and function of the shoulder, connecting the scapula to the humerus effectively. The other options do not accurately represent the distal attachment of the teres major. The greater tubercle serves as a point of attachment for other muscles like the rotator cuff, while the deltoid tuberosity is specifically for the deltoid muscle. The inferior angle of the scapula refers to another part of the scapula itself rather than a point of muscle attachment relevant to the motion facilitated by the teres major.

The teres major muscle has its distal attachment at the medial lip of the intertubercular groove of the humerus. This anatomical feature is significant as the intertubercular groove serves as a conduit for tendons of the shoulder muscles and allows for the muscle to contribute to the movements of the shoulder joint, such as adduction and medial rotation of the arm. By attaching to this specific area, the teres major plays an integral role in the stability and function of the shoulder, connecting the scapula to the humerus effectively.

The other options do not accurately represent the distal attachment of the teres major. The greater tubercle serves as a point of attachment for other muscles like the rotator cuff, while the deltoid tuberosity is specifically for the deltoid muscle. The inferior angle of the scapula refers to another part of the scapula itself rather than a point of muscle attachment relevant to the motion facilitated by the teres major.