Abstract
1. The angioarchitecture of the hypophysial vascular system of five men, fifteen dogs and five cats, has been observed histologically, in comparison with the perfused preparations of the India ink, and various possibilities of blood flow in the hypophysial portal system have been discussed.
2. In some parts from superior hypophysial arteries to the collecting veins through hypophysial portal veins, following elements have been found, which are regarded to participate in regulating the blood flow; a) swelling-cells b) epitheloid muscle cells c) blocking gurdle d) spiral valve e) strangulated veins (‘Drosselsvenen’) f) arterio-venous anastomoses.
3. Adenohpophysis is supplied with blood from superior hypophsial arteries through the portal veins. The venous valves and other several kinds of apparatuses menstioned above are cosidered to make an interruption or reversal of the blood flow in addition to the regulation.
4. The complicated mechanism of regulation of the blood flow in the hypophysial portal system gives an important clue to solve the functional correlation between hypophysis and diencephalon. On this standpoint, all results of previous physiological investigations should be checked again.
5. In the item of discussion, various possibilities as to the direction of the blood flow have been checked under consideration of the apparatuses in various regions of the hypophysial portal system.
