nerve cord


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Related to nerve cord: notochord

nerve cord

a strand of nervous tissue that forms part of the CENTRAL NERVOUS SYSTEM of invertebrates.
References in periodicals archive ?
0 mg/kg concentrations in midgut, brain, ventral nerve cord, hemolymph, and excreta.
In invertebrates, a nerve cord serves the same function as a vertebrate's spinal cord.
A recent study revealed that transient nuclear localization of [beta]-catenin at the 16-cell stage is required for specification of notochord and nerve cord fates in the anterior half; (59) that is, cells in which [beta]-catenin is not localized in the nucleus during the early stages become epidermal and neural cells, cells in which [beta]-catenin is localized in nucleus continuously from the 16-cell stage to the 32-cell stage become cells with endodermal fate (A6.
A recent study on sipunculan neurogenesis revealed that the larvae of this taxon undergo cryptic segmentation by forming a paired ventral nerve cord with associated, subsequently appearing, segmental commissures and four pairs of perikarya (Kristof et al.
In 1894, marine biologist Walter Garstang suggested that the primitive ciliary band, which harbors neurons, evolved into the dorsal nerve cord of vertebrates.
Recently, the pan-neural synaptotagmin B monoclonal antibody generated from the sea star radial nerve cord has been used to great effect in studies of the LNS of echinoids, holothuroids, and asteroids (Nakajima et al.
A notochord is a skeletal component, not a primitive nerve cord.
Serotonergic nerve fibers are found distal to the nerve nodule within the median nerve cord and the coronal nerve ring (MN and CN; Fig.
Each focal spot impinges on a bundle of nerves that feeds into a larger nerve cord, the researchers observed by microscopy.
Lower immunoreactivity levels suggest these are not the ventral nerve cord.
For example, the arthropod's nerve cord, its version of a spinal cord, rests in the ventral side.