Pectoralis major muscle

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The pectoralis major muscle is a large muscle of the chest that pulls the arm in toward the body when contracted. There is one pectoralis major on each side of the chest.

Contents

Origin

The pectoralis major originates at the clavicle, sternum, and several ribs covering most of the center of the chest.

Insertion

The insertion is at two points on the top of the humerus.

Innervation

The pectoralis major is innervated by the medial pectoral nerve and the lateral pectoral nerve.

Development

The pectoralis major muscles, often called 'pecs' in the bodybuilding world, are developed mainly with the bench press.

Word origin

The word pectoralis major comes from pectoralis, Latin for of the chest or of the breast. The major part of the word differentiates it from the pectoralis minor muscle, which sits underneath.

See also

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