Apical Sense Organ of Macracanthorhynchus hirudinaceus (Acanthocephala)

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Abstract
The apical sense organ in M. hirudinaceus consists of a broadly pestle-shaped, binucleate apical cell and associated structures that include processes from the apical sensory nerves and the sensory support cell duct, formerly named the anterior medial nerve. That duct and 2 nerve fibers of the apical sensory nerves enter the apical cell near the posterior end and extend anteriorly through the core to terminate in a depression at the apex of the proboscis. Each of the anterior proboscis nerves divides just posterior to the apical cell, forming branches that extend anteriorly on the outer surface of this cell. Additional divisions of these fibers occur near the crown. A diagram of the sensory support cell shows its general fractures and relationship to the apical and lateral sense organs.

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