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)
