Where does latissimus dorsi insert?

Where does latissimus dorsi insert?

• A. Crest of the greater tubercle.
• B. Intertubercular (bicipital) groove of the humerus.
• C. Lateral border of the scapula.
• D. Acromion.

Answer: (B)

The main point to know is where the latissimus dorsi attaches on the upper arm. It inserts into the floor of the intertubercular (bicipital) groove of the humerus. This tendon runs from the back across the axilla to the humerus, blending near the groove with nearby muscle tendons such as teres major. This insertion location enables the latissimus dorsi to extend, adduct, and medially rotate the arm. The other options point to sites not used by this muscle: the crest of the greater tubercle is associated with rotator cuff muscles and deltoid regions, the lateral border of the scapula and the acromion are scapular landmarks involved with other muscles, not the latissimus dorsi insertion.

The main point to know is where the latissimus dorsi attaches on the upper arm. It inserts into the floor of the intertubercular (bicipital) groove of the humerus. This tendon runs from the back across the axilla to the humerus, blending near the groove with nearby muscle tendons such as teres major. This insertion location enables the latissimus dorsi to extend, adduct, and medially rotate the arm.

The other options point to sites not used by this muscle: the crest of the greater tubercle is associated with rotator cuff muscles and deltoid regions, the lateral border of the scapula and the acromion are scapular landmarks involved with other muscles, not the latissimus dorsi insertion.