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Le Système Neurosécréteur Du Crustacé Isopode Asellus Aquaticus (Linné)

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Owing to the study of various stained preparations, the histological features of the neurosecretory cells and the distribution of these elements in the nerve centres of Asellus aquaticus (L.) have led to distinguish seven types of neurosecretory pericaryons. β and y cells are located in the protocerebron whereas basophil 1 and 1' cells are widely distributed in the whole central nervous system. The acidophil 2 neurosecretory pericaryons are found among the optic lobe neurons and the acidophil 2' neurosecretory cells are located in the ventral cortex of the mandibular ganglion. An isolated fusiform neurosecretory cell is inclosed in a neurohaemal formation. Two sinus nerves drain the secretory product, the migration of which along the axons greatly facilitates study of their complex course from the protocerebron to the pleotelson ganglion. The sinus nerves pathway presents connections with the nerve centres and includes several neurohaemal structures in which the neurosecretory product accumulates. The existence of metameric neurohaemal formations connected to the nervous cord is described for the first time in Peracarida.

Affiliations: 1: Laboratoire de Biologie Animale , Université de Nancy I, 54037, Nancy, France

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