The Neurosecretory Cells and Neurosecretions in the Developmental Stages of the Cotton Leafworm -Spodoptera Littoralis (B)
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In 1955 Nayar described two types of neurosecretory cells in lphita limbata (A- and B-types) . Later, Johannson  classified these cells into four categories: A, B, C and D, which he regarded as motor neurones of neurosecretory function. Furthermore, Delphin  recognized in the ventral ganglia of Schistocerca gregaria four classes of neurosecretory cells (A, B, C and D), and subdivided A and B into A1 , A2 , A3 and Bt. B2 , respectively. This was not accepted by the present writers , who considered that the different activity phases of their A-cells represent those identified by Delphin  as C- and D- types, and that the A1 , A2 , and A3 cells of Delphin correspond to the activity phases of their B-cells, and that the phases of activity of their C-cells represent the B1 and ~ types of Delphin. Banhawy and Anwar  reported that the neurosecretory cells and neurosecretory material in adult Gryllotalpa gryllotalpa L. are particularly rich in histones, SS and SH proteins, acid mucopolysaccharides and ascorbic acid. The present work was planned to find out if there is any variation in the neurosecretory activity in the different developmental stages of Spodoptera littoralis (B).