Diaphyseal artery filled canals in the phalanx proximalis of the horse

Arterial blood supply of hollow bones and arteries of the horse's front toe are described by bibliography. Cranial fetlocks of 32 horses have been examined by radiography to look for diaphyseal canals. The examination was completed by anatomical, angiographic and histological results. About 70% of X-ray pictures of the cranial Phalanx proximalis show a nutrient canal, either as a sagittal running translucent line in the dorsal compact substance (42%) or as an oblique or cross running translucent line in the distal border of Trigonum phalangis proximalis (58%). The nutrient foramen of the dorsal canal lies centrally beneath of M. extensor digitorum communis. The canal ends in the proximal part of medullary cave. The palmar nutrient canal leads from the medial rarely lateral side of Trigonum phalangis proximalis to the distal part of Cavum medullare. Those canals are filled with an artery coming from the dorsal or palmar branch of Arteriae digitales palmares medialis et lateris. The nutrient arteries always run from proximal to distal through compact substance and branch fountain-like in medullary cave