Intercostal arteries

There are 12 pairs of posterior and anterior arteries, 11 intercostal pairs, and 1 subcostal pair.

Anterior Intercostal Arteries

■ Pairs 1-6 are derived from the internal thoracic arteries.

• Pairs 7—9 are derived from the musculophrenic arteries.

■ There are no anterior intercostal arteries in the last two spaces; branches of the posterior intercostal arteries supply these spaces.

Posterior Intercostal Arteries

• The first two pairs arise from the superior intercostal artery, a branch of the costocer-vical trunk of the subclavian artery.

• Nine pairs of intercostal and one pair of subcostal arteries arise from the thoracic aorta.

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