The subcostal nerve (anterior division of the twelfth thoracic nerve) is larger than the others; it runs along the lower border of the twelfth rib, often gives a communicating branch to the first lumbar nerve, and passes under the lateral lumbocostal arch.
Cutaneous distribution of thoracic nerves.
|Anatomical terms of neuroanatomy|
It then runs in front of the quadratus lumborum, innervates the transversus, and passes forward between it and the abdominal internal oblique to be distributed in the same manner as the lower intercostal nerves.
It communicates with the iliohypogastric nerve of the lumbar plexus, and gives a branch to the pyramidalis muscle. It also gives off a lateral cutaneous branch that supplies sensory innervation to the skin over the hip.
- posteriorabdomen at The Anatomy Lesson by Wesley Norman (Georgetown University) (posteriorabdmus&nerves)
- glutealregion at The Anatomy Lesson by Wesley Norman (Georgetown University)
- Atlas image: abdo_wall70 at the University of Michigan Health System - "Posterior Abdominal Wall, Dissection, Anterior View"
- Anatomy figure: 40:07-00 at Human Anatomy Online, SUNY Downstate Medical Center - "Muscles and nerves of the posterior abdominal wall."
- Anatomy image:8982 at the SUNY Downstate Medical Center