Abstract
Atorella japonica were observed by TEM to examine the nerve plexus in the capitulum of the polyp and the cross-striated muscle cells of the strobila. The nerve plexus included a number of neuromuscular junctions and many interneural synapses. Neuromuscular junctions contained two types of synaptic vesicle: clear and small (ca 75 nm diam.), and dense cored and large (ca 120 nm diam.). The first type of vesicle always appeared near the presynaptic membrane and the second type was distributed behind the former. In interneural synapses, two types of vesicle which were similar to neuromuscular synaptic vesicles were recognized. They were distributed in a pattern similar to that of the neuromuscular synaptic vesicles, but these vesicles were found on both sides of the two synaptic membranes.
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