Which muscle inserts into the intertubercular (bicipital) groove of the humerus?

Which muscle inserts into the intertubercular (bicipital) groove of the humerus?

• A. Trapezius
• B. Latissimus dorsi.
• C. Rhomboid major
• D. Teres minor

Answer: (B)

Muscle attachments to the humeral intertubercular groove are key to how the arm moves. The floor of this groove is the insertion site for the latissimus dorsi, which anchors there to pull the arm into extension, adduction, and internal rotation. The long head of the biceps brachii runs through the groove, but its tendon is not the insertion in this context. The other muscles listed attach elsewhere: trapezius and rhomboid major insert on the scapula or skull/vertebrae, and teres minor attaches to the greater tubercle region rather than the groove itself. So, the latissimus dorsi is the muscle that inserts into the intertubercular groove of the humerus.

Muscle attachments to the humeral intertubercular groove are key to how the arm moves. The floor of this groove is the insertion site for the latissimus dorsi, which anchors there to pull the arm into extension, adduction, and internal rotation. The long head of the biceps brachii runs through the groove, but its tendon is not the insertion in this context. The other muscles listed attach elsewhere: trapezius and rhomboid major insert on the scapula or skull/vertebrae, and teres minor attaches to the greater tubercle region rather than the groove itself. So, the latissimus dorsi is the muscle that inserts into the intertubercular groove of the humerus.