part of part of Homo sapiens distal phalanx of manual digit 1 zone of long bone shaft of first distal phalanx of hand 2026-03-19T00:00:00Z A zone of bone organ comprising the flattened, tapering body of the distal phalanx of the thumb, lying between the base and the ungual tuberosity and providing dorsal and palmar surfaces for attachment of the nail bed and soft tissue pulp. David Osumi-Sutherland