part of part of limb segment digit 3 pastern region of limb in future this may be merged into a more species-neutral class for the distal and medial segments of a digit. A part of the leg of a horse between the fetlock and the top of the hoof. It incorporates the long pastern bone (proximal phalanx) and the short pastern bone (middle phalanx), which are held together by two sets of paired ligaments to form the pastern joint (proximal interphalangeal joint). SCTID:370725009 Wikipedia:Pastern UBERON:0009563