NERVE LIBRARY · Upper limb
Dorsal ulnar cutaneous nerve
Dorsal ulnar cutaneous nerve · DUC
Guyon canal lesions usually spare this branch; an abnormal response may suggest a more proximal lesion.
- Roots / nucleus
- C8–T1
- Function
- Sensory
- 3D protocols
- 1 related protocols
01Course and sensory territory
The dorsoulnar hand; this branch leaves the ulnar nerve proximal to the wrist.
02Motor supply
No motor supply.
03Localization clues
Guyon canal lesions usually spare this branch; an abnormal response may suggest a more proximal lesion.
04Combine the studies
Interpret alongside digit V sensory, ADM/FDI motor and across-elbow studies.
Explore the related 3D protocols
These retain the existing source-supported landmarks and references. The 3D model is educational; clinical work requires palpation and measured distances.
Progress stays in this browser. Marking a page as read is not a competency certification.
References and further reading
- Ulnar Mononeuropathy at the Wrist ↗AAPM&R KnowledgeNow · Society educational review · Link accessed 2026-09-08
- Upper and Lower Extremity Nerve Conduction Studies (2023) ↗AANEM · Technical course · Link accessed 2026-09-08
Educational synthesis; independent neuromuscular specialist review is pending. Publication dates and compilation dates are distinct. This is an original teaching synthesis; consult the source for complete methods and criteria.