A Support Cell to the Apical and Lateral Sensory Organs in Macracanthorhynchus hirudinaceus (Acanthocephala)

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Abstract
A large multinucleate cell is described with extension that serve the apical and lateral sensory organ in M. hirudinaceus. This cell is located ventral and slightly anterior to the cerebral ganglion. The body of the cell rests on the ventral surface of the midventral longitudinal receptacle (MVLR) muscle. Four large process, 1 from each corner, exit this cell. The 2 posterior processes follow the ventral receptacle muscles as they penetrate the proboscis sheath. Once inside this sheath they turn anteriorly, fuse, and then continue as a single process to the apical sensory organ. Each of the 2 anterior processes extends to opposite lateral surfaces of the MVLR muscle as they proceed anteriorly. Each anterior process then extends a short distance laterally between the proboscis sheath and longitudinal receptacle muscle. They then turn anteriorly accompanied by a large number of neurites. Eventually each extends through the body wall and terminates in a lateral sensory organ.

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