Studies on the Nervous System of Tetrathyridia (Cestoda: Mesocestoides)

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Abstract
The Gerebtzoff modification of the Koelle-Friedenwald cholinesterase technique was employed to demonstrate the nervous system of intact tetrathyridia of Mesocestoides corti. The extension of 10 longitudinal trunks from a bipartite brain and associated sucker ganglia to their termination in a plexus about the excretory bladder, the complexities of the circular commissures, as well as the presence of "heavy" peripheral nerve fibers penetrating the integument and a distinct "light" fiber system terminating in a subintegumental plexus are described. A series of variations in the basic nervous pattern associated with the asexual reproduction and with the presence of functional secondary excretory bladders along the proliferative side of the organism is discussed.

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