A study of the neurosecretory centres of the eyestalk in Siriella armata M. Edw. (Crustacea: Mysidacea): their involvement in molting and reproduction

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Abstract
Neurosecretory cells and centres arc described in the eyestalk of the mysid Siriela armata. The sinus gland is situated on the neuropilar regions along the main blood sinus. The medulla interna and medulla externa X organ is formed of G1 cells; the medulla terminalis X organ consists of G3 and G4 cells. Other neurons, the G2 cells, and a "giant cell" may also be neurosecretory. Destruction of the medulla interna – medulla externa X organ results in an inhibition of the preparation for molt and ecdysis in both sexes. Reproducing females also show inhibition of secondary vitellogenesis and of marsupial development. The role of the medulla interna – medulla externa X organ in the control of premolt, secondary vitellogenesis, and marsupial development is discussed.

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