[Role of endothelial and perivascular cells in the capillarogenesis of epiphysial cartilage channels].

Capillaries growing into cartilaginous epiphysis are protocapillaries, some of which are formed by "seamless" endothelium. Budding of endotheliocytes and presence of two nuclei in them are supposed to be the characters of incomplete (polyploidization) mitosis.