Abstract
Publisher Summary This chapter provides information on the neural and humoral interactions between basal prechiasmatic area and median eminence. In the Wistar female rat during proestrus, two types of neuronal responses were recorded in the basal prechiasmatic area (PVA), a part of organum vasculosum laminae terminalis, following electrical stimulation of the arcuate nucleus (ARC)-median eminence (ME) region, namely, antidromic and orthodromic responses. In the antidromically activated units, high frequency stimuli inhibited somadendritic spikes and subsequent spontaneous activity. These results, when taken in conjunction with the observation that LH-RH affected the arcuate nucleus-median eminence ARC-ME activity, suggest that the responsiveness to Luteinizing-hormone- releasing hormone (LH-RH) might characterize these structures. It also appears likely that the inhibitory effect of the ARC-ME on the basal PVA is mediated by an inhibitory interneuron.
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