Fig. 5
From: An overview of neuromuscular ultrasound of important small nerves
Sonoanatomy of the dorsal ulnar cutaneous nerve. Short-axis views of the dorsal ulnar cutaneous branch from its origin to the sixth extensor compartment. A Origin of the DUCN: the nerve is seen bifurcating from the main trunk of the ulnar nerve at the distal third of the forearm. B A level distal to the nerve origin. The nerve is seen running away from the main ulnar nerve trunk passing underneath the flexor carpi ulnaris muscle and its tendon. C The DUCN after it turns dorsally as it approaches the sixth extensor compartment. D The DUCN at the 6th extensor compartment running in the subcutaneous tissue superficial to the extensor carpi ulnaris tendon