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Ultrastructure of the neuromuscular system of the polyp ofAurelia aurita L., 1758 (Cnidaria, scyphozoa) by Fu-Shiang Chia; Helen M. Amerongen; Daniel J. Peteya is a Environmental Science article available to read on EtoBox.

What is Ultrastructure of the neuromuscular system of the polyp ofAurelia aurita L., 1758 (Cnidaria, scyphozoa) about?

Fine structural study indicates that the neuromuscular system of stage I polyps of Aurelia aurita is exclusively ectodermal. The three major muscle fields are the radial muscles of the oral disc, the longitudinal muscles of the tentacles, and the muscle cords of the septae and the column; the muscle fields are in physical continuity at the peristomial pits and share a common innervation and type of myofibril. The myofibril is striated in the tentacle base, in the outer oral disc, and in the upper part of the muscle cord; it grades into a smooth muscle toward the tentacle tip, the mouth, and the lower part of the cord. There is a fourth field of longitudinal smooth muscle in the pharynx. The nervous system consists of an epithelial sensory cell in the tentacle and a single type of neuron found in the subepithelial layer of the tentacle, oral disc, and muscle cord. The lack of gap junctions suggests that there is no nonnervous conduction system. The subepithelial layer also contains three types of fibers and a type of soma which cannot be characterized as neuronal. The soma is identified as the "neurosecretory cell" described in Chrysaora. The absence of neuromuscular elements in the

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Author

Fu-Shiang Chia; Helen M. Amerongen; Daniel J. Peteya

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)

Published

1984

Language

EN

Field

Environmental Science (Physical Sciences)