Which muscle inserts on the lesser tubercle of the humerus?

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Prepare for the NHI Eastern Kinesiology Test with our comprehensive quiz. Utilize flashcards and multiple-choice questions, complete with hints and detailed explanations. Ready yourself for success!

Multiple Choice

Which muscle inserts on the lesser tubercle of the humerus?

Explanation:
Subscapularis is the muscle that attaches to the lesser tubercle of the humerus. It sits on the anterior surface of the rotator cuff, arising from the subscapular fossa and inserting as a tendon onto the lesser tubercle. This placement fits its role as the primary medial rotator of the arm and a stabilizer of the shoulder joint. The other muscles listed insert elsewhere: for example, infraspinatus attaches to the greater tubercle, while levator scapulae and trapezius attach to the scapula or its surrounding structures rather than the humerus.

Subscapularis is the muscle that attaches to the lesser tubercle of the humerus. It sits on the anterior surface of the rotator cuff, arising from the subscapular fossa and inserting as a tendon onto the lesser tubercle. This placement fits its role as the primary medial rotator of the arm and a stabilizer of the shoulder joint. The other muscles listed insert elsewhere: for example, infraspinatus attaches to the greater tubercle, while levator scapulae and trapezius attach to the scapula or its surrounding structures rather than the humerus.

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