Classification Three locations (zones) in which the<unk>  nerve can be compressed within Guyon canal<unk>  may be characterized by the location or zone within the Guyon's canal at which the<unk>  nerve is compressed. The nerve divides into a superficial sensory branch and a deeper motor branch in this area. Thus, Guyon's canal can be separated into three zones based on which portion of the<unk>  nerve are involved. The resulting syndrome results in either muscle weakness or impaired sensation in the<unk>  distribution. Location Symptoms Associations Zone 1 Proximal (prior to<unk>  nerve bifurcation) Mixed motor & sensory Ganglia & hook of hammate fractures Zone 2 Surrounding deep motor branch<unk>  nerve Motor only Ganglia & hook of hammate fractures Zone 3 Surrounding superficial sensory branch of<unk>  nerve Sensory only<unk>  artery pathology Zone 2 type syndromes are most common, while Zone 3 are least common.
Ulnar tunnel syndrome
Radial tunnel syndrome
Carpal tunnel syndrome
Tarsal tunnel syndrome
Anterior interosseous syndrome
Heel pad syndrome
Löfgren syndrome
Iliotibial band syndrome