In postductal coarctation of aoa, vessels involved in the formation of collateral are all of the following, EXCEPT:: (A) Intercostal aery, (B) Internal thoracic aery, (C) Superior epigastric aery, (D) Veebral aery
Answer is D. In postductal coarctation of aoa patients will survive due to the establishment of circulation between the following vessels: 1. Anterior intercostal aery which are branches of internal thoracic branch of subclan aery and posterior intercostal aery which are branches of descending thoracic aoa. As a result intercostal aeries get dilated and erode the ribs which would be evident on the X Ray as notching of ribs. 2. Anastomosis between superior and inferior epigastric aery. Ref: Anatomy, Combined Edition By S. Mitra, page 7-26.