The ulnar nerve arises from the medial cord of the brachial plexus.
Its fibres come from the C7, C8 en Th1 roots.
The nerve first runs medial to the humeral artery and goes then through the medial intermuscular septum .
It courses in a distal direction, medially of the intermuscular septum and passes between the medial epicondyle of the humerus and the olecranon.
It enters the forearm between the humeral and ulnar origins of the flexor carpi ulnaris.
the nerve then furhter descends within the anteromedial compartment of the forearm, covered by the flexor carpi ulnaris.
At the wrist, the ulnar nerve is medial of the ulnar artery. It runs with the latter in the
so called Guyon canal, an osteofibrous canal formed by pisiforme and hamatus
Just distal to the pisiform it divides into its two terminal branches.
Possible points of nerve compression
The ulnar nerve can be compressed at:
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