| Functioning as neurohormone, neurotransmitter or neuromodulator, amines and peptides are important bioactive substances of crustaceans, and have received much attention from researchers. Studies on the anatomy, histology and cytology of the nervous system and the digestive system of Scylla serrata (Crustacea, Decapod) have been carried out, with the histological techniques, immunocytochemical techniques, electron microscopy techniques and electron microscopy immunocytochemical techniques respectively. The locations of the endocrine cells in the nervous system and the digestive system, which synthesize amines and peptides, were also studied.I The Nervous System Of Scylla serrata1.The character of the nervous system of Scylla serrata is that the sub-esophageal ganglion, thoracic ganglion and abdominal ganglion fused into a disc-like thoracie ganglion mass. In the ganglia of Scylla serrata, the neuron somas are collected in clusters, and they associate the neuropils with nerve tracts and commissures.The optical ganglion consists of the lamina ganglionaris(LG), the medulla extema (ME), the medulla interna (Ml) and the medulla terminalis (MT). The cerebral ganglion comprises 12 cell clusters and 11 neuropils. The sub-esophageal ganglion, the thoracic ganglion and the abdominal ganglion in the thoracic ganglion mass are made up of corresponding neurons and neuropils.The neurosecretory cells (NSC) can be classified according to the cytological appearance, staining ability and the characters of the secretory granules. Type I cells are located in the brain and the thoracic ganglion mass, Type II and Type III cells in the eyestalk, the brain and the thoracic ganglion mass; Type IV cells are the smallest in volume and the largest in number, they aggregate in N 9, NlO and N12 is in the brain, and scatter in other places of the central nervous system.2.Vertebrate antibodies of 5-HT. Glu, NPY, SOM, SP. Gas, ACTH, PP, Pro, Cal, hCG and hGH are applied, and imniunoreactivitv against the anterior 5 ones are present in the nervous system of ScylZa serrata. The results are as followed:(1)5-HT-like immunoreactivityImmunoreactive cells are observed in LG. ME, MI. MT and the optic lobepeduncle of the eyestalks. Except one Type II immunoreactive cell in the MTXO, the other immunoreactive cells are Type IV cells. Neither the neuropils nor the sinus gland shows immunoreactivity.Immunoreactivity occurs in 8 cell clusters and 7 neuropils of the brain. Type II and Type III cells predominate in the immunoreactive cells. Some of the Typeimmunoreactive cells are located in N9 and N 10, the others are distributed extensively in other cell clusters and neuropils.The inimunoreactive cells are less in the thoracic ganglion mass: the immunoreactive cells of the sub-esophageal ganglion are Type II and TypeIII, while Type I cells in the thoracic ganglion and the abdominal ganglion. The neuropils also present immunoreactivity. Immunoreactive Type LW cells disperse throughout the thoracic ganglion mass in a respectable number.(2)Glu-Iike immunoreactivityThe distribution of immunoreactive cells is seen in the eyestalk except LG. MT had many immunoreactive cells, which are aggregated in MTXQ. Both the ME and Ml have three immunoreactive layers. The immunoreactivity is strong in the neuropils of MT. The sinus gland is immunoreactive.Immunoreactivity is found in 10 cell clusters and 9 neuropils. Immunoreactive Type IV cells are entirely located in N9 and N 10.Type I cells predominate in the immunoreactive cells of the thoracic ganglion mass. Among the immunoreactive cells of the median sub-esophageal ganglion, TypeIII cells are dominant, while Type I cells dominant among the bilateral sub-esophageal ganglion. The immunoreactive cells in the thoracie ganglion are arranged in two distinct bands, which surround the thoracic artery foramen. The immunoreactive cells are concentrated in the abdominal ganglion. Immunoreactivity is strong in the neuropils of the thoracic ganglion mass.(3) NPY-like...
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