Related Experiment Video
Updated: Jan 6, 2026

Metacarpal Small Incision for Carpal Tunnel Syndrome
Published on: April 5, 2024
Aberrant positioning of the ulnar nerve found during carpal tunnel release: A case report
David R Veltre1, Kelvin Naito1, Xinning Li1
1Boston University School of Medicine Department of Orthopedic Surgery, Boston, MA, USA.
Abstract:
Aberrant positioning of the ulnar nerve volar to the carpal tunnel is a rare anatomic variation. We present the case of a 55-yearold female with unique ulnar nerve anatomy that was discovered intraoperatively during carpal tunnel release. The ulnar nerve was running directly adjacent to the median nerve in the distal forearm and as the median nerve traversed dorsal to the transverse carpal ligament (flexor retinaculum) to enter the carpal tunnel the ulnar nerve continued directly volar to this structure before angling towards Guyon's Canal. The unique ulnar nerve anatomy was successfully identified, carefully dissected and managed with a successful patient outcome. Variations of the anatomy at the level of the carpal tunnel are rare but do exist. Awareness of these anatomic variations and adequate visualization of the ulnar nerve along with the surrounding structures is crucial to avoid iatrogenic injuries during carpal tunnel release.
More Related Videos
06:40Screening of Axonal Degeneration in Carpal Tunnel Syndrome Using Ultrasonography and Nerve Conduction Studies
Published on: January 11, 2019
05:18Author Spotlight: Ultrasound-Guided Needle Release Combined with Corticosteroid Injection for the Treatment of Supinator Syndrome
Published on: May 26, 2023
Related Concept Videos
Bones of the Upper Limb: Ulna
Spinal Nerves: Plexus I
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...
Bones of the Upper Limb: Radius
The radius has a nail-shaped head, and a...
Muscles of the Forearm that Move the Hand and Fingers
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi...
Arteries of the Upper Limbs