Pectoral Muscles (Origin, Insertion, Action, Innervation)

Subclavius: insertion

middle third of clavicle

Pectoralis Minor: action

draws scapula inferiorly and anteriorly

Pectoralis Major: action

flexion, medial rotation, horizontal adduction of UE

Pectoralis Minor: nerve/spinal segment

medial pectoral n. (C8,T1)

Pectoralis Major: origin

clavicular head, medial clavicle, sternal head (sternum, upper 6 costal cartilages)

Pectoralis Minor: insertion

coracoid process

Serratus Anterior: nerve/spinal segment

long thoracic nerve (C5,6,7)

Subclavius: origin

1st rib

Pectoralis Minor: origin

3rd-5th ribs

Subclavius: action

depresses clavicle

Serratus Anterior: action

holds scapula against thoracic wall, protracts and retracts scapula

Pectoralis Major: insertion

lateral lip of intertubercular groove of humerus

Pectoralis Major: nerve/spinal segment

lateral pectoral n. (C5,6,7), medial pectoral n. (C8,T1)

Serratus Anterior: origin

lateral surface of ribs 1-8

Serratus Anterior: insertion

medial border of scapula

Subclavius: nerve/spinal segment

n. to subclavius (C5,6)