[Extraorganic vessels of the epiphysis of humans and placental mammals in their comparative anatomic aspect].

The extraorganic arteries and veins of the pineal gland were studied by methods of injections with staining masses in 166 preparations of the brain of placentry mammals and 15 preparations of the human brain. The difference in the external structure and the topography of the organ in representatives of different orders of mammals is described. An increased amount of additional sources of blood supply, of the extraorganic arteries to the following organ, extraorganic and intracapsular anastomoses between them and of extraorganic veins in higher mammals (primates) as compared with lower mammals (insectivorous) was found. The epiphysis veins are described. The later were note to fall not only into the great cerebral vein, but to be tributaries of internal cerebral and basal veins or to fall immediately into direct or transverse sinuses of the dura mater in a quite a number of representatives of different animal species. An increased intensity of the body supply of the organ, indirectly pointed out by an increased number and diameter of extraorganic arteries and veins might be explained by different levels of the functional activity of the epiphysis in higher mammals as compared with lower mammals.