Abstract
Vasopressin-, oxytocin-, somatostatin-, neurotensin-, and TRH-like immunoreactive neurons in respect to their distribution in the paraventricular nucleus of the rat were examined by light microscopic immunocytochemistry using the peroxidase-anti-peroxidase (PAP) method. Distinct and characteristic patterns were observed for each peptide neuron. The coexistence of different peptide-containing neurons and the effect of the ascending catecholamine neuron system upon peptide neurons in the paraventricular nucleus are briefly discussed.
