Morphology and function of the support cell and the nerve tracts innervating the presoma of Moniliformis moniliformis (Acanthocephala)

Abstract

The nerve tracts emerging from the cerebral ganglion of Moniliformis moniliformis were examined using electron microscopy. Nerve cells in the cerebral ganglion Moniliformis moniliformis send their processes into the nerve tracts. Type A, B, and D neurons contributed their processes to the nerves innervating putative sensory structures located on the neck and tip of the proboscis, and were classified as putative sensory neurons. Large numbers of electron-dense vesicles observed in the type A and B axons were correlated with the presence of the catecholamine dopamine. Type C neurons were seen to innervate receptacle wall muscles. The presence of neuromuscular-type junctions, with round, clear vesicles near presynaptic membranes, was observed. The type C neurons were therefore classified as putative motor neurons. Type E processes did not contribute to the nerve tracts.