nerve net

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nerve net

n.
A diffuse network of neurons that conducts impulses in all directions from the area stimulated, forming the nervous system in certain invertebrates such as the cnidarians.

nerve net

a system of interconnecting nerve cells, in the form of a net, found in those groups of invertebrates which lack a CENTRAL NERVOUS SYSTEM, such as COELENTERATES and ECHINODERMS. In other groups the nerve net is almost nonexistent. Conduction is slow across the net and is often in all directions, as the synapses are not usually unidirectional.
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The distinct and consistent staining of different neuronal populations with tubulin and FMRFamide antibodies suggests a tie to the two primary subumbrellar nerve nets described from behavioral and physiological studies of scyphomedusae (Romanes, 1876, 1878; Horridge, 1956a; Passano, 1965).
While the nerve nets are the most conspicuous components of the scyphozoan nervous system, it is much more complex.
This latter property requires the same diffuse conduction as seen in the GFNN, giving the scyphomedusae two parallel nerve nets in the subumbrellar ectoderm, but with a distinct sensory component or sensory inputs.
Neurons in the rhopalia, nerve ring, and nerve nets of all species are immunoreactive to [alpha]- or [beta]-tubulin antibodies and the FMRFamide antibody.
Initial evaluation of the motor nerve nets of the three muscle sheets indicated clear differences in the neuronal density, with the highest density in the frenula and the lowest in the subumbrella (Figs.
In Tripedalia, neurites of the subumbrellar and velarial motor nerve nets exhibited no dominant directional trend (Fig.
This nerve net was particularly dense, however, at the base of the capitate portion of the tentacle, immediately under the cluster of cnidocytes (Fig.
1K) and processes from these merged with the immunoreactive nerve net.
The Cx43-like protein is localized in the luminescent endoderm and in the mesogleal nerve net
Specific Cx43-like immunoreactivity was present in all tissue layers of autozooid polyps but was more prevalent in the luminescent endoderm and in the mesogleal nerve net.
1979; Giles and Usherwood, 1985), has recently been shown to depolarize neurons in the motor nerve net (MNN) of the scyphozoan jellyfish Cyanea capillata (Anderson and Trapido-Rosenthal, 1990).
In some preparations the myoepithelium that envelops the MNN neurons was removed to expose the nerve net (Anderson and Schwab, 1984).