Question: what is the origin and insertion of pectoralis major?
Answer: The clavicular head originates from the inner part of the clavicle (collarbone). ... Both the clavicular and sternal heads of the pectoralis major insert on the same two locations, which are the bicipital groove of the humerus and the deltoid tuberosity of the humerus. The humerus is the long bone of the upper arm.