(OINA) Muscles Connecting Upper Limb to Thoracic Wall

Pectoralis Major (Action)

Adducts arm and rotates it medially; clavicular fibers also flex arm

Pectoralis Minor (Action)

Depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin

Subclavius (Action)

Depresses the clavicle and steadies this bone during movements of the shoulder girdle

Serratus Anterior (Action)

Draws the forward anterior around the thoracic wall; rotates scapula

Pectoralis Major (Origin)

Clavicle, sternum, and upper six costal cartilages

Pectoralis Minor (Origin)

3rd, 4th, 5th ribs

Subclavius (Origin)

1st costal cartilage

Serratus anterior (Origin)

Upper eight ribs

Pectoralis maj. (Insertion)

Lateral lip of bicipital groove of humerus

Pectoralis min. (Insertion)

Coracoid process of scapula

Subclavius (Insertion)

Clavicle

Serratus Anterior (Insertion)

Medial border and inferior angle of scapula

Pectoralis maj. (Nerve Supply)

Medial and Lateral pectoral nerves from brachial plexus

Pectoralis min. (Nerve Supply)

Medial pectoral nerve from brachial plexus

Subclavius (Nerve Supply)

Nerve to subclavius from upper trunk of brachial plexus

Serratus Anterior (Nerve Supply)

Long Thoracic Nerve

Pectoralis maj. (Nerve Roots)

C5, C6, C7, C8; T1

Pectoralis min. (Nerve Roots)

C6, C7, C8

Subclavius (Nerve Roots)

C5, C6

Serratus Anterior (Nerve Roots)

C5, C6, C7