1. Richie-comeau
Site
- ulna to median in palm
- provides motor to the thenar muscles
- ulna dominate hand
- may be due to RC anastomosis
Clinical significance
- carpal tunnel syndrome with no thenar atrophy
2. Martin-Gruber
Site
- median to ulna in forearm
- provides motor function to hypothenar eminence
Clinical significance
- cubital tunnel syndrome with no hypothenar atropy
- may be due to MG anastomosis