EFFECT OF AMYGDALOID NUCLEAR LESIONS ON HYPOTHALAMIC LUTEINIZING HORMONERELEASING FACTOR IN THE MALE DEERMOUSE

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Abstract
Recently, it was found that lesions placed in the basolateral amygdaloid nuclear complex result in the continuous release of luteinizing hormone (LH) from the hypophysis of the male and female deermouse (Eleftheriou & Zolovick, 1967; Eleftheriou, Zolovick & Norman, 1967). These findings, together with previous work on the amygdala, indicate the existence of a separate inhibitory centre, in both sexes, for the regulation of LH secretion. The mechanism by which lesions in the amygdaloid complex affect changes in the pituitary and plasma levels of LH is not established. The present report deals with the effects of lesions placed in the basolateral amygdaloid complex on the content of hypothalamic luteinizing hormone-releasing factor (LH—RF) in the stalk-median eminence region of the male deermouse (Peromyscus maniculatus bairdii). Adult male deermice, weighing 15–19 g., were lesioned bilaterally by thermocoagulation in the basolateral nuclear group of the amygdaloid complex according to the stereotaxic atlas for

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