Fig. 1From: Donor nerve graft assessment for covering thumb nerve defects: a cadaveric studySchematic of thumb nerve zones. The figure illustrates the anatomical description of the palm, emphasizing on palmar digital nerves and zoning of the thumb. Zone 1 = distal to the interphalangeal joint. Zone 2 = proximal to the interphalangeal joint. Zone 3 = distal to the flexor retinaculum and proximal to the metacarpophalangeal jointBack to article page