This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'A pt. operated for direct inguinal hernia developed anethesia at the root of the penis and adjacent pa of the scrotum the nerve likely to be injured is ? \nSelect and explain. \nA. Genital br. of genitofemoral nerve (supply daos muscle), B. Femoral br. of genitofemoral nerve, C. Iliohypogastric nerve, D. Ilioinguinal nerve', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e. ilioinguinal nerve All the three nerves ie genifotemoral, ilioinguinal & iliohypogastric are branches of the lumbar plexus and all may be injured in op. for hernia.llioinguinal-Nerveenters the inguinal canal by piercing the internal oblique muscle (not through the deep ring)*it then emerges from the superficial inguinal ring to supply skin ofproximomedial skin of the thighskin over the penile root.upper pa of the scrotumIliohypogastric nervesdivides into two branches - lateral cutaneous and anterior cutaneous.lateral cutaneous supplies - posterolateral gluteal skinAnterior cutaneous supplies - suprapubic skinGenitofemoral nerve divides into two branchesGenital andFemoralGenital br of Genitofemoral nerve - enters the inguinal canal at its deep ring and supplies- the Cremaster*- the scrotal skin*Femoral br of genitofemoral nerve- passes behind the inguinal ligament, enters the femoral sheath lateral to femoral aery*, pierces the ant layer of the femoral sheath and fascia lata and supplies the skin anterior to the upper pa of femoral triangle.From these descriptions it is obvious that the nerve likely to be injured is ilioinguinal nerve.", 'role': 'assistant'}]