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.
References in periodicals archive ?
Thomas Holstein of the Centre for Organismal Studies demonstrated how the origin of nerve cell centralization can be traced back to the diffuse nerve net of simple and original lower animals like the sea anemone.
The swim system includes a cluster of pacemaker cells in each rhopalium; a conducting system in the nerve ring, which links the rhopalial pacemakers but also distributes excitatory impulses to the subumbrella; and a subumbrellar motor nerve net, which synaptically activates the circular muscle that lines the bell cavity (Satterlie, 1979; Eichinger and Satterlie, 2014).
Comb jellies also possess a simple form of nervous system, called a nerve net, and their genome contains many of the genes involved in the nervous system.
I like the Portuguese singer Dulce Ponte and also Nerve Net by Brian Eno.
The scyphozoan solution involves the use of such a diffuse, non-polarized nerve net for distribution of motor commands (Mayer, 1910; Bozler, 1926a, b; Horridge, 1956a).
Immunohistochemical staining of scyphomedusae with monoclonal antibodies against [alpha]- or [beta]-tubulin shows a subumbrellar nerve net that has the distribution and neuronal characteristics of the motor nerve net that controls the swim musculature (Giant Fiber Nerve Net, also called the Motor Nerve Net; Horridge, 1956a, b; Schwab and Anderson, 1980; Anderson and Schwab, 1981).
Frequency-dependent facilitation has been described in the swim muscle of Carybdea, as well as apparently asymmetric enhanced contractions in response to quick "double pulses" in the motor nerve net (Satterlie, 1979, 2002).
This nerve net was particularly dense, however, at the base of the capitate portion of the tentacle, immediately under the cluster of cnidocytes (Fig.
They were first seen in some of the 20-d cuticle stage hydra, and in later stages both the number of RFamide-positive neurons and the complexity of the RFamide-positive nerve net increased (Figs.
The larger image on the cover shows a nerve net in the base of an adult stained with both antibodies (the scale, in micrometers, is about 10 times that of the inset).
Luminescence spreads over the colony as a wave that mirrors the spatio-temporal dynamics of excitation in the underlying colonial nerve net (Nicol, 1955; Anderson and Case, 1975).
Using electron microscopy, we observed various-sized granular vesicles in bipolar-like nerve cells of the gastrodermal nerve net.