VARIATIONS OF THE ULNAR NERVE AND ULNAR ARTERY IN GUYONS CANAL - A CADAVERIC STUDY

In 23 cadaveric hands the hypothenar region was studied and this repor t is about the anatomical boundaries and contents of Guyon's Canal. It was noted that the contents of Guyon's canal exit through two distinc t areas termed the deep distal hiatus and superficial distal hiatus. A variation in the course of the deep branch of the ulnar artery, repor ted to be infrequent, was found to be present in 74% of the specimens. We concluded that the ulnar artery exits distal to the space describe d by Guyon. When a release of the ulnar nerve is undertaken, surgery s hould not only open the roof of Guyon's space but also the fibrous arc ade of the deep distal hiatus.