Where does the pectoralis major insert?

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Explore muscle actions, origins and insertions. Enhance your knowledge with engaging flashcards and detailed multiple-choice questions with explanations. Prepare confidently for your test!

Multiple Choice

Where does the pectoralis major insert?

Explanation:
The pectoralis major inserts on the humerus at the intertubercular groove, specifically the lateral lip of that groove on the bone’s anterior surface. This placement means when the muscle contracts, it pulls the humerus toward the body (adduction) and rotates it inward, with the clavicular part helping to flex the arm. The other sites belong to different muscles or structures: the deltoid tuberosity is for the deltoid, the crest of the greater tubercle is not the pectoralis major’s insertion, and the medial border of the scapula is associated with other muscles.

The pectoralis major inserts on the humerus at the intertubercular groove, specifically the lateral lip of that groove on the bone’s anterior surface. This placement means when the muscle contracts, it pulls the humerus toward the body (adduction) and rotates it inward, with the clavicular part helping to flex the arm. The other sites belong to different muscles or structures: the deltoid tuberosity is for the deltoid, the crest of the greater tubercle is not the pectoralis major’s insertion, and the medial border of the scapula is associated with other muscles.

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