It has become apparent in recent years that regulation of the ovulatory cycle cannot be accomplished solely through the mediation of the two pituitary gonadotropins, follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Within the last decade, discoveries of additional regulatory mechanisms involved in the neuroendocrine control of the events of the ovulatory cycle have provided new insight into the control of this complex biological phenomenon (127). Among the most interesting of these discoveries are …