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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