Regular vein, aery and nerve CVAN') arrangement is not present in which intercostal space (not the rib):

Ans. a. First intercostal spaceRegular vein, aery and nerve (`VAN') arrangement is not present in first intercostal space.First RibThe first rib is supplied by the internal thoracic aery and superior intercostal aery. Venous drainage is the intercostal vein.The rib is innervated by first intercostal nerve.The first intercostal vessels and nerve pass along the lower surface between intercostal intimi and costal pleura with arrangements of nerve, aery and vein from above downwards.