Chest

Clavicular head – Medial clavicle
- Sternal head – Sternum and costal cartilages of
superior ribs

- Lateral bicipital (intertubercular) groove of humerus

Both:
- Adduction of shoulder
- Horizontal adduction of shoulder
- Internal rotation of shoulder
Clavicular head:
- Flexion of shoulder
Sternal head:
- Extension of shoulder to neutral

Clavicular head – Lateral and medial pectoral nerves
- Sternal head – Medial pectoral nerve

Anterior surface of ribs 3-5

Coracoid process of scapula

- Protraction of scapula
- Depression of scapula
- Downward rotation of scapula

Medial pectoral nerve

Lateral surface of
superior ribs

Medial (vertebral)
border of scapula

- Protraction of scapula
- Upward rotation of
scapula
- Holds scapula to
thoracic wall

- Long thoracic nerve

- Costal cartilage of rib 1

- Inferior border of clavicle

- Stabilizes clavicle

Nerve to subclavius

Transverse processes of cervical vertebrae

Ribs 1 and 2

- Elevation of ribs 1 and 2
- Flexion of cervical vertebrae
- Lateral flexion of cervical vertebrae

- Anterior rami of spinal nerves

- Sternal head – Manubrium
- Clavicular head – Medial clavicle

- Mastoid process

- Flexion of neck
- Ipsilateral lateral flexion of neck
and contralateral rotation of neck

- Cranial nerve XI

- Fascia over upper chest

- Mandible

- Tension of skin of neck

- Cranial nerve VII

- Inferior margin of rib above

- Superior margin of rib below

- Elevates ribs during inspiration

- Intercostal nerves

- Superior margin of rib below

- Inferior margin of rib above

- Depresses ribs during forced expiration

- Intercostal nerves