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Titolo:
ELECTRON-MICROSCOPIC ANALYSIS OF SYNAPTIC INPUTS FROM THE MEDIAN PREOPTIC NUCLEUS AND ADJACENT REGIONS TO THE SUPRAOPTIC NUCLEUS IN THE RAT
Autore:
ARMSTRONG WE; TIAN M; WONG H;
Indirizzi:
UNIV TENNESSEE,COLL MED,DEPT ANAT & NEUROBIOL,855 MONROE AVE MEMPHIS TN 38163
Titolo Testata:
Journal of comparative neurology
fascicolo: 2, volume: 373, anno: 1996,
pagine: 228 - 239
SICI:
0021-9967(1996)373:2<228:EAOSIF>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYPOTHALAMIC PARAVENTRICULAR NUCLEUS; VASCULOSUM LAMINA TERMINALIS; ANTEROVENTRAL 3RD VENTRICLE; LOCAL OSMOTIC STIMULATION; GAMMA-AMINOBUTYRIC-ACID; LEUKOAGGLUTININ PHA-L; SUBFORNICAL ORGAN; VASOPRESSIN NEURONS; IMMUNOCYTOCHEMICAL ANALYSIS; NEUROSECRETORY NEURONS;
Keywords:
VASOPRESSIN; OXYTOCIN; OSMOTIC; ORGANUM VASCULOSUM OF THE LAMINA TERMINALIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
62
Recensione:
Indirizzi per estratti:
Citazione:
W.E. Armstrong et al., "ELECTRON-MICROSCOPIC ANALYSIS OF SYNAPTIC INPUTS FROM THE MEDIAN PREOPTIC NUCLEUS AND ADJACENT REGIONS TO THE SUPRAOPTIC NUCLEUS IN THE RAT", Journal of comparative neurology, 373(2), 1996, pp. 228-239

Abstract

The median preoptic nucleus (MnPo) is critical for normal fluid balance, mediating osmotically evoked drinking and neurohypophysial hormonesecretion. The influence of the MnPo on vasopressin and oxytocin release is in part through direct connections to the supraoptic and paraventricular nucleus. In the present investigation the synaptic contacts between the MnPo and supraoptic neurons were investigated in rats by ultrastructural examination of terminals labeled anterogradely with thetracers Phaseolus vulgaris-leucoagglutinin or biotinylated dextran. At the light microscopic level, labeled fibers within the supraoptic nucleus branched frequently, were punctuated by varicosities, and were distributed throughout the nucleus without preference for the known distributions of oxytocin and vasopressin neurons. At the ultrastructurallevel, synapses were associated with many of these varicosities. The ratio of labeled axodendritic to axosomatic synapses encountered was roughly consistent with a uniform innervation of dendrites and somata. The great majority of synapses were characterized by symmetrical contacts. Similar results were found for a few injections made in the organum vasculosum of the lamina terminalis, just rostral to the MnPo, and in the immediately adjacent periventricular preoptic area. Coupled with other recent anatomical and electrophysiological evidence, these results suggest there is a strong monosynaptic pathway from structures along the ventral lamina terminalis to the supraoptic nucleus. (C) 1996 Wiley-Liss, Inc.

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Documento generato il 21/09/20 alle ore 03:33:47