The course of the ulnar nerve is as follows:1
The ulnar nerve originates from the medial cord of the brachial plexus and runs inferior to the posteromedial aspects of the humerus, passing behind the medial epicondyle (in the cubital tunnel) at the elbow where it is exposed for several centimetres.
This is a companion discussion topic for the original article at https://patient.info/doctor/neurology/ulnar-nerve-disorders