Ontogeny of neuroendocrine centers in the eyestalk ofHomarus gammarusembryos: an anatomical and hormonal approach
- 1 July 1995
- journal article
- research article
- Published by Informa UK Limited in Invertebrate Reproduction & Development
- Vol. 27 (3), 233-245
- https://doi.org/10.1080/07924259.1995.9672453
Abstract
The ontogeny of the eyestalk neuroendocrine centers of the European lobster, Homarus gammarus, throughout embryonic development has been studied using light and electron microscopy, and the localization of specific neuroendocrine substances has been identified by immunocytochemistry. The procephalic lobes, which are the prospective eyestalks, develop progressively during embryonic development. In the nauplius stage two neuron masses are well defined. The visual structure originates from one of them and the neuroendocrine structure from the other. The four definitive optic ganglia are present at the mid-metanauplius stage and retain their appearance and location in larvae and adults. The organ of Bellonci, an internal sensory structure, appears at the mid-metanauplius stage and is mainly characterized by onion bodies. The medulla terminalis X-organ complex, an important neuroendocrine system, is present and already functional at the beginning of the embryonic metanauplius stage. Two neurohormones have been visualized immunocytochemically: the crustacean hyperglycemic hormone (CHH) and the gonad inhibiting hormone (GIH). Both neuropeptides are localized in the perikarya of neuroendocrine cells of the X-organ as well as in their tracts joining the presumptive sinus gland. However, the sinus gland has only been observed in the early larval stages just after hatching.Keywords
This publication has 29 references indexed in Scilit:
- Ontogeny of the sinus gland and of the organ of Bellonci in larvae and postlarvae of the European lobsterHomarus gammarusInvertebrate Reproduction & Development, 1994
- Crustacean neuropeptides: Structures, functions and comparative aspectsCellular and Molecular Life Sciences, 1992
- Metamorphosis in the Lobster Homarus (Decapoda): A ReviewJournal of Crustacean Biology, 1991
- Immunological relationships between neuropeptides from the sinus gland of the lobster Homarus americanus, with special references to the vitellogenesis inhibiting hormone and crustacean hyperglycemic hormoneGeneral and Comparative Endocrinology, 1991
- Patterns of appearance of serotonin and proctolin immunoreactivities in the developing nervous system of the American lobsterJournal of Neurobiology, 1990
- Isolation, characterization and physiological specificity of the crustacean hyperglycemic factors from the sinus gland of the lobster,Homarus americanus(Milne-Edwards)Invertebrate Reproduction & Development, 1989
- Do the neurohormones VIH (vitellogenesis inhibiting hormone) and CHH (crustacean hyperglycemic hormone) of crustaceans have a common precursor? Immunolocalization of VIH and CHH in the X-organ sinus gland complex of the lobster,Homarus americanusInvertebrate Reproduction & Development, 1989
- The molt cycle and its hormonal control in Rhithropanopeus harrisii larvaeDevelopmental Biology, 1980
- A low-viscosity epoxy resin embedding medium for electron microscopyJournal of Ultrastructure Research, 1969
- THE USE OF LEAD CITRATE AT HIGH pH AS AN ELECTRON-OPAQUE STAIN IN ELECTRON MICROSCOPYThe Journal of cell biology, 1963