The sulcus nervi ulnaris is a bony groove on the posterior aspect of the medial epicondyle of the humerus, in which the Ulnar nerve runs close to the surface.
Imaging
The sulcus nervi ulnaris can be visualized on MRI and ultrasound and used to assess the ulnar nerve.
Clinical relevance
Chronic compression of the ulnar nerve within the sulcus nervi ulnaris leads to Ulnar tunnel syndrome[^1].