part of part of in taxon Equidae sesamoid bone autopod region equine distal sesamoid UBERON:0010759 SCTID:370654009 Lies on the palmar aspect of the coffin joint between the second phalanx and third phalanx. articulates closely with the distal phalanx, to which it is connected by the impar ligament of the navicular bone. The impar ligament is very strong and permits relatively little motion between the navicular bone and the distal phalanx. navicular bone Wikipedia:Navicular_bone#Horse_anatomy distal sesamoid bone appendicular ossicle autopod bone