Node of Ranvier is defined as:
1. short unmyelinated section of Axon between segments of myelin
2. regular gaps along the Axon where the myelin is interrupted
3. gaps that oc
cur at regular intervals in the myelin sheath of medullated nerve fibres, between adjacent Schwann cells
4. any of the constrictions along the myelin sheath that surrounds an axon of a nerve cell: nodes are formed where two Schwann cells meet and are essential to the proper transmission of nerve impulses
The key functions of Nodes of Ranvier include:
1. Allowing nutrients and waste products to enter/leave the neurone.
2. Allowing nerve impulses to move along the neurone through a process of de-polarisation and re-polarisation of the nerve membrane.
Node of Ranvier is named after Louis-Antoine Ranvier Ranvier (1835-1922), a French histologist, pathologist and anatomist.
Related Articles | |
CSF at psychology-glossary.com | ■■■■■■■ |
CSF is the abbreviations of Cerebrospinal fluid, a protective fluid that surrounds and supports the brain . . . Read More | |
Oligodendrocytes at psychology-glossary.com | ■■■■■■ |
Oligodendrocytes is a type of non-neural cell the projections of the surface membrane of each such cell . . . Read More | |
Myelin at psychology-glossary.com | ■■■■■■ |
Myelin is defined as a fatty layer which coats some axonsan insulating material composed of fats and . . . Read More | |
Neuron at psychology-glossary.com | ■■■■■■ |
Neuron refers to individual nerve cell responsible for transmitting informationIn psychology, "neuron" . . . Read More | |
Membrane at psychology-glossary.com | ■■■■■■ |
Membrane refers to structure that separates the inside of a cell from the outsideIn psychology, "membrane" . . . Read More | |
Interneuron at psychology-glossary.com | ■■■■■ |
Interneuron refers to neuron whose axons and dendrites are entirely contained within a given structure. . . . Read More | |
Ganglion cell at psychology-glossary.com | ■■■■■ |
Ganglion cell is defines as a type of neuron in the retina that receives input from the bipolar cells . . . Read More | |
Neuromuscular at psychology-glossary.com | ■■■■■ |
Neuromuscular describes the junction synapse between axon terminal of a motor neuron and the motor end . . . Read More | |
Action potential at psychology-glossary.com | ■■■■■ |
Action potential : Action potential refers to a brief change in electrical voltage that occurs between . . . Read More | |
Axon at psychology-glossary.com | ■■■■■ |
Axon refers to a long, thin part of a neuron attached to the somadivides into a few or many branches, . . . Read More |