SUBCOSTAL NERVE

 

ORIGIN: Spinal cord segment T12
 

COURSE/DISTRIBUTION: It is the largest ventral ramus of all thoracic nerves. It gives a communicating branch to L1 nerve, which is called dorsolumbar nerve. It is part of the neurovascular bundle on the costal groove of the 12th rib and it lies below the subcostal artery. It then accompanies the subcostal artery and in the groove gives off its collateral branch, and enters the abdominal wall by passing through the lateral arcuate ligament. It runs behind the kidney. It then crosses in front of the quadratus lumborum and supplies the internal oblique muscle and the transversus abdominis. It communicates with the iliohypogastric nerve and then gives a branch to the pyramidalis.

BRANCHES:

bulletMuscular branches
bulletCollateral branch
bulletLateral cutaneous branch

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