injuries poisoning
How To Do a Median Nerve Block
Relevant Anatomy
The median nerve lies deep to the flexor retinaculum and about one centimeter under the skin of the volar wrist. The palmaris longus tendon lies superficial to the retinaculum and is absent in up to 20% of patients. The median nerve is located slightly lateral (radial) to the palmaris longus tendon and medial (ulnar) to the flexor carpi radialis tendon. 