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  • Title: Electron microscopic studies of medullary synaptic inputs to vasopressin-containing neurons in the hypothalamic paraventricular nucleus.
    Author: Shioda S, Nakai Y, Iwase M, Homma I.
    Journal: J Electron Microsc (Tokyo); 1990; 39(6):501-7. PubMed ID: 2094755.
    Abstract:
    We have observed the ascending projections from the lower brain stem to the magnocellular vasopressin-like immunoreactive (VP-LI) neurosecretory neurons in the paraventricular nucleus (PVN) using electron microscopy. The tissues were prepared by a double labeling technique combining anterograde tracing after iontophoretic injection of wheat germ agglutinin-coupled horseradish peroxidase (WGA-HRP) in the A1 group (lateral reticular nucleus in the medulla oblongata) with VP immunocytochemistry. Both the WGA-HRP-labeled and the unlabeled axon terminals made synaptic contacts with VP-LI cell bodies and processes in the PVN. This indicates a direct synaptic influence of medullary A1 group on the secretory activity of the VP-containing neurons in the hypothalamic paraventricular nucleus.
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