| preganglionic fibres | A fibre whose cell body is located in an autonomic nucleus in the spinal cord or brain stem and whose axon terminates in an autonomic (motor) ganglion; found in nerves conveying sympathetic or parasympathetic fibres. (05 Mar 2000) |
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| pressor fibres | Sensory nerve fibre's whose stimulation causes vasoconstriction and rise of blood pressure. (05 Mar 2000) |
| projection fibres | Nerve fibre's connecting the cerebral cortex with other centres in the brain or spinal cord; fibres arising from cells in the central nervous system that pass to distant loci. (05 Mar 2000) |
| Sappey's fibres | Nonstriated muscular fibre's in the check ligaments of the eyeball. (05 Mar 2000) |
| Prussak's fibres | Elastic and connective tissue fibre's bounding the pars flaccida membranae tympani. (05 Mar 2000) |
| Purkinje's fibres | <cardiology, pathology> A group of specialised cardiac muscle cells that conduct electrical impulses through the heart and are involved in regulating the heart beat. The fibres form the terminal portion of the heart conduction system and have central granulated protoplasm containing one or two nuclei and a transversely striated peripheral portion. They are the terminal ramifications of the conducting system of the heart found beneath the endocardium of the ventricles. See: conducting system of heart. (10 Jul 2002) |
| pyramidal fibres | The fibres that compose the pyramidal tract (corticospinalis). Synonym: fibrae corticospinales, corticospinal fibres, fibrae pyramidales. (05 Mar 2000) |
| Sharpey's fibres | Bundles of collagenous fibre's that pass into the outer circumferential lamellae of bone or the cementum of teeth. Synonym: Sharpey's fibres. (05 Mar 2000) |
| skeletal muscle fibres | Multinucleated contractile cells varying from less than 10 to 100 um in diameter and from less than 1 mm to several centimeters in length; the fibre consists of sarcoplasm and cross-striated myofibrils, which in turn consist of myofilaments; human skeletal muscles are a mixture of red, white, and intermediate type fibre's. (05 Mar 2000) |
| hypothalamocerebellar fibres | Nerve fibres originating from cells in the hypothalamus and projecting to the cerebellar cortex and nuclei. (05 Mar 2000) |
| spinoreticular fibres | Nerve fibres originating from the spinal cord and terminating in the reticular formation of the brainstem. Synonym: spinoreticular tract. (05 Mar 2000) |
| Nelaton's fibres | See: transverse rectal folds. Synonym: Nelaton's fibres. (05 Mar 2000) |
| nerve fibres | Slender processes of neurons, especially the prolonged axons that conduct nerve impulses. (12 Dec 1998) |
| nerve fibres, myelinated | Grayish white nerve fibres whose axons are encased in a myelin sheath which may in turn be enclosed by a neurilemma (a thin membrane spirally enwrapping the myelin layers). (12 Dec 1998) |
| striatonigral fibres | Nerve fibres originating from cells of the caudate and putamen and terminating mainly in the pars reticulata of the substantia nigra; they utilise GABA and substance P. Synonym: striatonigral fibres. (05 Mar 2000) |