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>Neurosecretory centers from the eyestalk ofSiriella armataM. Edw. (Crustacea: Mysidacea): ultrastructural variations during normal and experimentally inhibited molt cycle
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Neurosecretory centers from the eyestalk ofSiriella armataM. Edw. (Crustacea: Mysidacea): ultrastructural variations during normal and experimentally inhibited molt cycle
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机译：Neurosecretory centers from the eyestalk ofSiriella armataM. Edw. (Crustacea: Mysidacea): ultrastructural variations during normal and experimentally inhibited molt cycle
The ultrastructure of the medulla interna-medulla externa X-organ (MI-ME Xo)-sinus gland (SG) complex in the eyestalk ofSiriella armatais described during the normal and the experimentally inhibited molt cycle. In the normal SG, four types of neurosecretory axon terminals, each containing distinguishable neurosecretory granules, can be described. Thus, type-2 granules are synthesized by G1 neurons forming the MI-ME Xo. The cell bodies and axonal endings of these cells in the sinus gland have been examined at the following molt stages: intermolt (stage C4), premolt (D0 and D2), and postmolt (A1, A2 and B). Changes in ultrastructure of the G1 cells have been monitored and correlated to inhibitions of the molt-and reproductive cycle produced by electrocauterization of the MI-ME Xo. The results obtained suggest that the neurosecretion from the G1 cells exerts a positive influence on molt and brood preparation. The occurrence of a distal group of G1 cells whose axons terminate at a different site from the SG suggests that the neural factors of the MI-ME Xo are diverse and control different physiological activities.
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