Upper two posterior intercostal aeries arise from ?: (A) Aoa, (B) Superior intercostal aery, (C) Internal mammary aery, (D) Bronchial aery
Answer is B. Ans. B) Superior intercostal aeryThe 1st and 2nd posterior intercostal aeries arise from the supreme intercostal aery, a branch of the costocervical trunk of the subclan aery. The lower nine aeries are the aoicintercostals, so called because they arise from the back of the thoracic aoa.