Distribution of the vascular network of the adenohypophysis of the rat

From various experiments it has been suggested that the blood flow to the different parts of the adenohypophysis is not the same. By developing the peroxidase activity of the red and white blood cells we have obtained a satisfactory image of the distribution of the intrahypophysial vessels, which indicate that the organization and distribution of these vessels varies from one portion to another in the pars distalis. On the lateral portion of the gland vascular routes are irregular, whilst in the media zone they run in a sagittal plane. Between the above-mentioned portions, on either side of the edge of the pars intermedia, a rich vascular network extending along the dorsal limit, which is fed by the long portal vessels and by numerous smaller vessels from the ventral vascular chain of the pars intermedia and neural lobe, is observed.