nerve fibre


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Related to nerve fibre: neurone, myelinated nerve fiber

nerve fibre

the AXON of a NERVE (1) together with its surrounding membranes.
Part of a myelinated nerve fibre.

nerve fibre

component of all nerves and their branches in the peripheral nervous system (PNS), and of the tracts in the central nervous system (CNS). The central axontransmits nerve impulses (action potentials) to the nerve terminal in motor (efferent) nerves, or from a receptor to a nerve cell body in sensory (afferent) nerves. Also common to all nerve fibres are an outermost covering (neurilemma) and within that the Schwann cells which are crucial to the regeneration process if a fibre is damaged. In myelinated nerve fibres (including motor nerves to skeletal muscle) there is a fatty myelin sheath between the axon and the neurilemma, interrupted at intervals by the 'nodes of Ranvier'; action potentials 'jump' between these, enabling faster conduction. Each efferent nerve fibre runs from a nerve cell body to terminal branches at a nerve-to-nerve synapse or at an effector organ; each afferent fibre runs from a sensory receptor to a relay site in the CNS.
References in periodicals archive ?
The computer programme, run over several days, took information about the length of nerve fibres in the primate brain and neuronal connections called axons in the brain of a species of worm known as Caenorhabditis elegans.
By inserting a thin electrode into a nerve in the forearm we can listen in on the nerve and pick up signals from one of the thousands of nerve fibres that make up a nerve," explains Associate Professor Hakan Olausson, who is leading the research group behind the discovery, together with Johan Wessberg.
Generally there are still some nerve fibres that are undamaged.
The damage disrupts messages travelling along nerve fibres, either slowing them down, distorting them, preventing them from getting through and short circuiting them.
The team, led by Dr Georgio Terenghi at the Royal Free Hospital in London, has just started growing nerve fibres through the polymer tubes in the laboratory.
During the research, the scientists discovered that nerve fibres regenerate in the area of the brain for sense and smell.
Scientists discovered nerve fibres regenerate in the area of the brain for sense and smell.
Curiously, however, the authors found that nerve fibres containing CGRP-alpha are actually reduced under painful conditions - leading them to investigate where the increased CGRP in the skin came from.
Researchers at Pennsylvania University in America observed that the pigs' damaged nerve fibres produced A-beta - a sticky substance that helps set the stage for the development of protein plaques in the brain linked with Alzheimer's.
The brain works like an electrical circuit, sending impulses along nerve fibres in the same way that current is sent through wires.
In multiple sclerosis, loss of myelin leads to the nerve fibres in the brain becoming damaged.
A team of experts from the Unilever company, the University of Gothenburg in Sweden, and the University of North Carolina have identified a class of nerve fibres in the skin which specifically send pleasure messages.