Abstract
The control mechanisms of the hypothalamo-hypophysio-ovarian axis were investigated in breeding Japanese quail by means of electrolytic or radiofrequency lesions in various regions of the hypothalamus. Depending on the site of damage to the hypothalamus, two forms of ovarian dysfunction were observed. Lesions in anterior regions of the infundibular nuclear complex or in the anterior division of the median eminence resulted in regression of the ovary and oviduct; all follicles of the ovaries of these birds measured less than 3 mm in diameter. These conditions are interpreted as indicative of cessation of the release of folliclestimulating hormone from the adenohypophysis. Lesions in medial, ventral and posterior regions of the infundibular nuclear complex or in the preoptic region of the hypothalamus resulted in cessation of ovulation, but did not cause complete regression of the ovary and oviduct. In these birds the ovaries and oviducts were reduced somewhat in weight, but the ovarian follicles remained large and laden with yolk. This condition is thought to result from the cessation of the release of luteinizing hormone from the adenohypophysis.
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Schedule a callMore From: Zeitschrift fur Zellforschung und mikroskopische Anatomie (Vienna, Austria : 1948)
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