| James fibres | Atrio-His bundle connections thought to be the basis for the short P-R interval syndrome; these fibre's should be distinguished from the internodal tracts of the atrium, sometimes referred to as "James tracts." Synonym: James tracts. (05 Mar 2000) |
|---|---|
| exogenous fibres | Nerve fibre's by which a given region of the central nervous system is connected with other regions; the term applies to both afferent and efferent fibre connections. (05 Mar 2000) |
| external arcuate fibres | They include: 1) dorsal external arcuate fibres that arise from cells in the accessory or lateral cuneate nucleus and pass to the cerebellum; 2) ventral external arcuate fibres that arise from the arcuate nuclei at the base of the medulla oblongata and pass around the lateral surface of the medulla; both enter the cerebellum as components of the restiform portion of the inferior cerebellar peduncle. Synonym: fibrae arcuatae externae. (05 Mar 2000) |
| yellow fibres | Fibre's that are 0.2 to 2 um in diameter but may be larger in some ligaments; they branch and anastomose to form networks and fuse to form fenestrated membranes; the fibre's and membranes consist of microfibrils about 10 nm wide and an amorphous substance containing elastin. Synonym: yellow fibres. (05 Mar 2000) |
| fastigiobulbar fibres | Nerve fibres projecting from the fastigial nuclei of the cerebellum to the brain stem; crossed and uncrossed fibres that terminate mainly in the vestibular and reticular nuclei, and in the medial accessory olivary nucleus. (05 Mar 2000) |
| fastigiospinal fibres | Crossed descending fibres originating in the fastigial nucleus of the cerebellum and ending in the spinal cord gray matter at cervical, and possibly lower, levels. (05 Mar 2000) |
| kinetochore fibres | Fibres of the mitotic spindle attached to the centromere and extending toward the poles. Compare: astral fibres, polar fibres. (05 Mar 2000) |
| unmyelinated fibres | A fibre having no myelin covering (CNS); a naked axon; in the PNS represented by all axons lying in troughs in a single Schwann cell (Schwann cell unit); a slow conducting fibre. Synonym: gray fibres, nonmedullated fibres, Remak's fibres. (05 Mar 2000) |
| zonular fibres | Delicate fibres that pass from the equator of the lens to the ciliary body, collectively known as the ciliary zonule. Synonym: fibrae zonulares. (05 Mar 2000) |
| km fibres | <cell biology> Bundles of microtubules running longitudinally below and to one side of the bases of cilia in a kinety. (17 Dec 1997) |
| Korff's fibres | Argyrophilic fibre's that pass between odontoblasts at the periphery of the dental pulp and fan out into the dentin. (05 Mar 2000) |
| fibres of lens | <biology, ophthalmology, physiology> The elongated cells of ectodermal origin forming the substance of the crystalline lens of the eye. Synonym: fibrae lentis. (05 Mar 2000) |
| acetyl CoA-(beta-aminoethyl)-L-cysteine omega-N-acetyltransferase | <enzyme> Forms s-(beta-n-acetyl-aminoethyl)-l-cysteine Registry number: EC 2.3.1.- Synonym: acoac-acetyltransferase, acetyl coenzyme a-(beta-aminoethyl)-l-cysteine omega-n-acetyltransferase (26 Jun 1999) |
| acetylgalactosaminylgalactosylgalactosylglucosylceramide beta-D-acetylgalactosaminyltransferase | <enzyme> Forms galnac-beta1-3galnac-beta1-3gal-alpha1-4gal-beta1-4glc-cer Registry number: EC 2.4.1.- Synonym: forssman glycolipid synthase, udp-galnac globotetraoside n-acetylgalactosaminyl transferase (26 Jun 1999) |
| acetylgalactosaminyl-O-glycosyl-glycoprotein beta-1,3-N-acetylglucosaminyltransferase | <enzyme> Forms oligosaccharide core class 3 (glcnac beta 1-3galnac) in mucins and various glycoproteins Registry number: EC 2.4.1.147 Synonym: udp-glcnac-galnac-r beta 3-acetylglucosaminyltransferase, agggag-transferase (26 Jun 1999) |