neurosecretory system and neurosecretory material in insects

ABSTRACT

Three types of neurosecretory cells exist in the nervous system of insects [A, B and C- types]. They vary in number in the different parts of the nervous system. Neurosecretory cells display different cyclic phases of activity. Marked histological, cytological and histochemical differences are demonstrated between neurosecretory and non-neurosecretory cells. The problem of neurosecretory system and nature of neurosecretory material has been the subject of investigation by the present writer and one of his collaborators in Gryllotalpa gryllotapa [Banhawy and Anwar, 1970, 1971, 1972 a, b 1973] and in Spodoptera littoralis [Banhawy and Anwar, 1977]. A detailed study was also previously made by Moussa and the present writer oft the secretory organelles and cytochemistry of neurosecretory material in Schistocerca gregaria [Moussa and Banhawy, 1958 a, b; 1959, 1961 a, b]