part of part of Homo sapiens proximal phalanx of manual digit 1 zone of long bone shaft of first proximal phalanx of hand 2026-03-19T00:00:00Z A zone of bone organ comprising the elongated cylindrical body of the proximal phalanx of the thumb, connecting the base to the head and providing attachment surfaces for the flexor and extensor tendons of the thumb. David Osumi-Sutherland