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Encyclopedia > Renshaw cell

Renshaw cells are located in the spinal cord horn. The spinal cord consists of various cross-sectional regions. ...


They are inhibitory interneurons found in the spinal grey, and associated in two ways with an alpha motor neuron. Firstly, they receive an excitatory collateral from the alpha neuron's axon as they emerge from the motor root, so that they are "kept informed" of how vigorously that neuron is firing. Secondly, they send their own inhibitory axon to synapse with that alpha neuron. The rate of discharge of the Renshaw cell is thus broadly proportional to the rate of discharge of the associated motor neuron, and the rate of discharge of the motor neuron is broadly inversely proportional to the rate of discharge of the Renshaw cell. Renshaw cells thus act as "limiters," or "governors," on the alpha motor neuron system, thus helping to prevent muscular damage from tetanus. . An interneuron is a neuron that communicates only to other neurons. ... Tetanus is a serious and often fatal disease caused by the neurotoxin tetanospasmin which is produced by the Gram-positive, obligate anaerobic bacterium Clostridium tetani. ...


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Behavior (2137 words)
Cells that are on the edge of the bar of light are stimulated by the light, but only inhibited by the stimulated cells on one side and not inhibited by its neighbors in the dark.
Cells on the dark edge of the bar of light are not stimulated, but are inhibited by their neighbors in the light.
Receptor cells and horizontal cells feed onto bipolar cells which lead up to the inside of the retina and contact amacrine cells which also lie horizontally, but at this higher level and ganglion cells which are the output cells and whose axons form the optic nerve.
Renshaw cell - Wikipedia, the free encyclopedia (174 words)
Renshaw cells are located in the spinal cord horn.
The rate of discharge of the Renshaw cell is thus broadly proportional to the rate of discharge of the associated motor neuron, and the rate of discharge of the motor neuron is broadly inversely proportional to the rate of discharge of the Renshaw cell.
Renshaw cells thus act as "limiters," or "governors," on the alpha motor neuron system, thus helping to prevent muscular damage from tetanus.
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