. Control of ovulation; proceedings of the conference held at Endicott House, Dedham, Massachusetts, 1960. Ovulation -- Regulation. Interactions between the Central Nervous System and Hormones 81 and Derbyshire (15). Their findings have been confirmed repeatedly during the past 20 years, and a basal tuberal area especially sensitive to this type of stimulation has been outlined by Saul and Sawyer (16, 17) (Fig. 1). Localized electrolytic lesions in the middle of this area block copulation-induced ovulation in the rabbit with or without causing ovarian atrophy (18,19). An almost identical site,
. Control of ovulation; proceedings of the conference held at Endicott House, Dedham, Massachusetts, 1960. Ovulation -- Regulation. Interactions between the Central Nervous System and Hormones 81 and Derbyshire (15). Their findings have been confirmed repeatedly during the past 20 years, and a basal tuberal area especially sensitive to this type of stimulation has been outlined by Saul and Sawyer (16, 17) (Fig. 1). Localized electrolytic lesions in the middle of this area block copulation-induced ovulation in the rabbit with or without causing ovarian atrophy (18,19). An almost identical site, extending from ventromedial nuclei to mammillary bodies, has been delineated in the cat hypothalamus by Robison and Sawyer. OLFACTORY, BULB LAT OLFACTORY STRIA AMYGDALA Fig. 2. Relationships of rhinencephalic structures and sites of lesions. A, transection of olfactory tracts or removal of bulbs; B, transection of fornix; C, septal lesion; D, amygdaloid lesion. MB, mammillary body; MFB, medial forebrain bundle; PIT, hypophysis. From Sawyer (19). (20, 17) (Fig. 1) in which stimulation during estrus induces ovulation and lesions cause ovarian atrophy. Differential regions have been outlined which appear to control reproductive behavior in the two species (Fig. 1). Stimu- lation of these areas does not induce ovulation, and lesions do not lead to ovarian atrophy but do produce a condition of permanent anestrus which cannot be reversed by exogenous estrogen; ovulation can still be induced by direct stimulation of the gonadotropic area. Projecting into the hypothalamus are numerous fiber tracts from the rhinencephalon or limbic lobe, the part of the brain which Papez (21) proposed as the anatomical substrate of emotion. These pathways include the medial forebrain bundle from olfactory and other rostral areas, the fornix from the hippocampus and the stria terminalis from the amygdala. The projections are now considered two-way circuits (22), but evidence of their involvement. Please
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