[Ultrastructural changes in the posterior lobe of the pituitary in tetanus poisoning]

Ultrastructural studies (electron microscopy) of the caudal part of the hypothalamo-hypophysial neurosecretory system were conducted in rats during experimental tetanus. Its activation was found to occur as soon as the initial period after the injection of the toxin, this being apparently connected with the administration of the heterogenous protein, because inactivated toxin proved to induce the same effect. Changes in the vascular permeability, lipid metabolism and the blood coagulation system were also observed.