The Neuroendocrine Control of the Menstrual Cycle
Elsevier eBooksPublished 1 January 1980
Ernst Knobil
Citations1,293
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TL;DR
The construction of a model of the neuroendocrine control system that governs the 28-day ovarian cycle of the rhesus monkey is discussed, which has three basic components: the arcuate nucleus of the hypothalamus, the gonadotrophs of the pituitary gland, and the ovary.
Abstract
This chapter discusses the construction of a model of the neuroendocrine control system that governs the 28-day ovarian cycle of the rhesus monkey. This model has three basic components: the arcuate nucleus of the hypothalamus, the gonadotrophs of the pituitary gland, and the ovary. The arcuate nucleus is the central component of the control system. The gonadotrophs respond to this unvarying pulsatile gonadotropin releasing hormone (GnRH) stimulation by releasing pulses of follicle stimulating hormone (FSH) and luteinizing hormone (LH). Immature follicles respond to this unvarying gonadotropic stimulus by increasing in size and secreting increasing quantities of estradiol, which achieve maxima near mid-cycle. This process occupies approximately 14 days. The magnitude of the response to each GnRH pulse is modulated by estradiol acting directly on the gonadotrophs. The characteristic duration of the rhesus monkey ovarian cycle is thus determined by the duration of follicular development. This can occur in the presence of an absolutely unvarying pattern of hypophysiotropic stimulation.
Keywords
PsychologyMedicineNeuroscience
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