- Source: Subcostal nerve
The subcostal nerve (anterior division of the twelfth thoracic nerve) is a mixed motor and sensory nerve contributing to the lumbar plexus. 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.
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 and the ilioinguinal nerve of the lumbar plexus, and gives a branch to the pyramidalis muscle and the quadratus lumborum muscle. It also gives off a lateral cutaneous branch that supplies sensory innervation to the skin over the hip.
Additional images
See also
Subcostal artery
Subcostal vein
References
This article incorporates text in the public domain from page 948 of the 20th edition of Gray's Anatomy (1918)
External links
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