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 ?
Savini G, Zanini M, Carelli V Sadun AA, Ross-Cisneros FN, Barboni P Correlation between retinal nerve fibre layer thickness and optic nerve head size: an optical coherence tomography study.
Scientists carried out a computer analysis of databases containing detailed information of worldwide anatomical studies on primate and worm brains, and found that long nerve fibre connections were just as vital to overall brain function as short ones.
Visual acuity is usually not affected in these cases; however Patient may have relative scotomas if sufficient number of myelinated nerve fibres are present.
You are starving the nerve fibres of nutritious oxygen," New Scientist quoted Efron as saying.
OECs help this process by re-opening the surface of the bulbs for the new nerve fibres to enter — leading Raisman and his team to believe transplanting OECs into the damaged spinal cord could enable severed nerve fibres to re-grow.
On ophthalmologic examination, retinal medullated nerve fibres were seen in the inferotemporal retina of left eye and in the superior as well as inferior sectors of the retina of right eye.
Normally, sympathetic nerve fibres regulate blood flow in blood vessels.
From the bulbs, nerve fibres travel to the olfactory centre in the brain.
But, like the wires in a wall plug, nerve fibres have to be attached to the right places.
Professor James Fawcett's Cambridge-based team believes it is close to a clinical treatment that could allow nerve fibres to regenerate within the spinal cord and encourage remaining nerve fibres to work more effectively.
A substance called myelin protects the nerve fibres of the central nervous system and helps the messages travel quickly and smoothly between the brain and the rest of the body.