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External intercostal

Other Terms: Musculi intercostales externi, Musculus intercostalis externa, Muscle intercostaux externes

Muscle parts

None

Latin name

Musculi intercostales externi

Latin muscle parts

None

Group

Thoracic wall – lateral musculature – external layer

Etymology

In English, this muscle’s name is the outward muscle between the ribs. The word intercostal comes from the Latin terms inter meaning “between” and costa meaning “rib.” The Latin term externus means “outward.”

Origin

Inferior border of superior rib

Insertion

Superior border of adjacent inferior rib

Action

Stiffen the chest wall to prevent paradoxical motion during descent of the diaphragm; move the ribs.

Nerve supply

Intercostal nerves (T1 through T11)

Blood supply

Anterior intercostal arteries from the internal thoracic artery via the subclavian artery. Superior intercostal artery from the costocervical trunk of the subclavian artery. Posterior intercostal arteries from the aorta. Superior and lateral thoracic arteries from the axillary artery, along with branches from the pectoral branch of the thoracoacromial artery.

Latin

Musculi intercostales externi

Latin

Musculus intercostalis externa

French

Muscle intercostaux externes

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