Quick Facts
Origin: Largest sensory branch of the perineal nerve.
Course: Pierces the urogenital diaphragm to enter the superficial perineal pouch. It runs anteromedially in the urogenital triangle.
Branches: None.
Supply: Provide cutaneous sensory innervation to posterior labium majus.
Origin
The posterior labial nerve is the largest sensory branch of the perineal nerve, which in turn is a branch of the pudendal nerve. The analogous structure in males is the posterior scrotal nerve.
Course
The posterior labial nerve pierces the urogenital diaphragm to enter the superficial perineal pouch. It then runs anteromedially from the lateral border of the urogenital triangle (along with the posterior labial artery and vein) and innervates the skin of the posterior part of the labium majus.
Branches
There are no named branches.
Supplied Structures
Sensory to the skin of the posterior part of labium majus.
