Upper two posterior intercostal aeries arise from ?
Aoa
Superior intercostal aery
Internal mammary aery
Bronchial aery
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.