Abstract
The ultrastructure of seven different types of neurosecretory cells (NSC) found in the medial and lateral areas of the brain of diapausing Manduca sexta is described. The five different types of NSC in the medial area have characteristic differences in their shape, size, neurosecretory granules (NSG), and the morphology of their organelles. The cell types of the medial area accumulated the NSG, but did not appear to be synthesizing and packaging new NSG, whereas the NSC in the lateral region were synthesizing and packaging NSG during diapause. The possible significance of the relationship between the lateral and medial cells is discussed.
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