<prompt> All are branches of lumbar plexus exceptIliohypogastric nerveIlioinguinal nerveObturator nerveSubcostal nerve  <response>: LUMBAR PLEXUS - The lumbar plexus lies in the posterior pa of the substance of the psoas major muscle. It is formed by the ventral rami of the upper four lumbar nerves .The first lumbar nerve receives a contribution from the subcostal nerve, and the fouh lumbar nerve gives a contribution to the lumbosacral trunk; which takes pa in the formation of the sacral plexus. The branches of the lumbar plexus are given below - 1. The iliohypogastric nerve LI, 2. The ilioinguinal nerve LI, 3. The genitofemoral nerve LI, L2 ventral divisions, 4. The lateral cutaneous nerve of the thigh L2, L3; dorsal divisions, 5. The femoral nerve L2, L3, L4; dorsal divisions, 6. The obturator nerve L2, L3, L4; ventral divisions, 7. The lumbosacral trunk L4, L5; ventral rami. Ref : B D Chaurasias Human Anatomy , seventh edition , volume 2 , pg. no. 373 