Etude du contrôle endocrinien du cycle spermatogénétique chez Lithobius forficatus L. (Myriapode Chilopode). Rôle du complexe “ce ules neurosécrétrices des lobes frontaux du protocérébron - G andes cérébrales”

Abstract

The influence of the neurosecretory cells of the frontal lobes of the protocerebron and the cerebral glands has been studied in Lithobius forficatus L. (Myriapoda Chilopoda). The partial or complete destruction of the secretory complex stimulates the development of the genital products and spermiogenesis. The destruction followed by reimplantation restores a spermatogenetic cycle comparable to that of the control animals. The removal of the cerebral glands, a reservoir for secretory products, is more effective than the destruction of neurosecretory cells. The experiments of massive implantation and those of unilateral removal of the cerebral glands demonstrate the role of hormone titers. In short, the neurosecretory cells of the frontal lobes of the protocerebron and the cerebral glands seem to have inhibitory effects on the spermatogenetic cycle; they act essentially by moderating the metabolism of spermatocyte growth.