nerve fibre

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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 ?
Following the onset of arthritis in the rats, however, these fibres began to sprout into the inflamed skin over the joint and wrap around the pain-sensing nerve fibres instead.
They showed that the nerve fibres could be guided to their correct targets using a particular growth factor - a biological chemical that promotes growth.
Generally there are still some nerve fibres that are undamaged.
Instead the study found that long nerve fibre connections were just as vital as short ones.
The damage disrupts messages travelling along nerve fibres, either slowing them down, distorting them, preventing them from getting through and short circuiting them.
Unfortunately, as people with MS age, remyelination decreases significantly, resulting in more nerve fibres being permanently lost.
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.
He has now shown this is true using a corneal confocal microscope: on average, the corneas of diabetic people with nerve damage have a lower density of nerve fibres, and nerves are shorter than in healthy controls.
Washington, Mar 15 (ANI): Scientists at the University of Edinburgh have identified a protein crucial for maintaining the health and function of nerve fibres in brain that controls transmission of messages within the brain.