What is the insertion point for the pectoralis major?

The pectoralis major is a significant muscle located in the chest, and its insertion point is crucial for understanding its function and biomechanics. The muscle inserts at the humerus, specifically at the intertubercular groove, which allows it to play a major role in movements of the shoulder joint.

This insertion facilitates actions such as flexion, adduction, and medial rotation of the arm. When the pectoralis major contracts, it brings the arm closer to the body and allows for various forms of upper body movement, which is essential in many sports and daily activities.

The other options—femur, radius, and coccyx—are incorrect because they do not relate to the pectoralis major. The femur is the thigh bone, the radius is one of the forearm bones, and the coccyx is the tailbone. None of these are connected to the actions or location of the pectoralis major in the upper body. Thus, recognizing the insertion point as the humerus is fundamental for understanding the muscle's role in upper limb movements.