The iliohypogastric nerve is the first nerve of the lumbar part ( lumbar plexus ) of the lumbosacral plexus . It arises from the first lumbar segments L1 of the spinal cord , in humans also from the 12th chest segment (Th12). Due to the poorly developed plexus character (hardly any fiber exchange with other spinal cord segments), some authors do not consider it to be part of the lumbar plexus.
The main trunk of the iliohypogastric nerve runs between the obliquus internus abdominis and the transversus abdominis muscle towards the middle of the abdomen. In doing so, it releases branches that cascade through the layers of the abdominal wall and thus also reach the skin.
The iliohypogastric nerve, together with the ilioinguinal nerve, innervates the abdominal muscles as well as the sensitive skin of the abdomen .
In mammals with 7 lumbar vertebrae (e.g. predators ) the first two lumbar nerves are known as the iliohypogastric nerves. A distinction is made between a cranial iliohypogastric nerve from L1 and a caudal iliohypogastric nerve from segment L2.
- Franz-Viktor Salomon: nervous system, systema nervosum. In: Franz-Viktor Salomon, Hans Geyer, Uwe Gille (Ed.): Anatomy for veterinary medicine. Enke, Stuttgart 2004, ISBN 3-8304-1007-7 , pp. 464-577.