Pectoralis Major

Pectoralis Major The pectoralis major is one of the muscles in the pectoral region of the thorax. The other muscles in this region include the pectoralis minor and the subclavius. The pectoralis minor lies underneath the pectoralis major, and is a much smaller muscle – hence the name. The subclavius, as the name suggests, is located under (“sub”) the clavicle (“clavius”), attaching at one end to the bottom of the clavicle. And at the other to the first rib. The pectoralis major muscle has a few actions at the shoulder joint: flexion adduction medial rotation There are two main parts …

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