Question

How many nerves supply the abdominal wall?

A) 4

B) 5

C) 6

D) 7

Answer 1

The abdominal wall is innervated by 5 main nerves: the lower thoracic nerves T7 to T11, the subcostal nerve T12, and branches of the first lumbar nerve L1.

Step-by-step explanation:

The abdominal wall is supplied by the nerves that arise from the lumbar plexus. Specifically, the torso region is innervated by the lower thoracic nerves (T7 to T11), the subcostal nerve (T12), and the first lumbar nerve (L1) through its iliohypogastric and ilioinguinal branches. In total, 5 main nerves supply the abdominal wall: the lower six thoracoabdominal nerves (T7-T11 and subcostal T12) and the aforementioned first lumbar spinal nerve branches (L1).