Pectoralis minor muscle

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The pectoralis minor muscle is a muscle in the chest that connects several ribs at the front of the chest to the scapula (shoulder blade). The pectoralis minor is located underneath the pectoralis major muscle.


Subclavius muscle Pectoralis major muscle Pectoralis major muscle Pectoralis major muscle Deltoid muscle Pectoralis minor muscle Subscapularis muscle Subscapularis muscle Subscapularis muscle Biceps brachii muscle Coracobrachialis muscle Brachialis muscle Serratus anterior muscle Intercostal muscles Intercostal muscles Intercostal muscles Intercostal muscles Intercostal muscles Intercostal muscles Intercostal muscles Teres major muscle Teres major muscle Latissimus dorsi muscle Latissimus dorsi muscle Coracoid process Clavicle Sternum'The deep muscles of the shoulder.'

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The deep muscles of the shoulder. These are covered by the superficial layers.

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Action

The pectoralis minor assists other muscles, notably the serratus anterior muscle, in protracting the scapula by pulling downward on the coracoid process. If the scapula is being held in place by other muscles, then it elevates the ribs it originates at.

Origin

The pectoralis minor originates from the third, fourth, and fifth ribs at the front of the chest. Some individuals vary in this location, having a pectoralis minor that originates instead from the second, third, and fourth ribs.

Insertion

The pectoralis minor inserts at the medial and upper surfaces of the coracoid process - the part of the scapula that protrudes forward under the clavicle near the shoulder joint.

Innervation

The pectoralis minor is innervated by the medial pectoral nerve.

Word origin

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

See also

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