| ACM | acetaminophen; acute cerebrospinal meningitis; Adriamycin, cyclophosphamide, methotrexate; albumin- ... |
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| ACM | Arnold--Chiari malformation |
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| arbor | A kind of latticework formed of, or covered with, vines, branches of trees, or other plants, for shade; a bower. Origin: OE. Herber, herbere, properly a garden of herbs, F. Herbier, fr. L. Herbarium. See Herb, and cf. Herbarium. 1. <botany> A tree, as distinguished from a shrub. 2. [Cf. F. Arbre. <mechanics> An axle or spindle of a wheel or opinion. A mandrel in lathe turning. Arbor Day, a day appointed for planting trees and shrubs. Origin: L, a tree, a beam. Source: Websters Dictionary (01 Mar 1998) |
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| arbor dianae | <chemistry> A precipitation of silver, in a beautiful arborescent form. Origin: L, the tree of Diana, or silver. Source: Websters Dictionary (01 Mar 1998) |
| arbor vitae | 1. <botany> An evergreen tree of the cypress tribe, genus Thuja. The American species is the T. Occidentalis. 2. <anatomy> The treelike disposition of the gray and white nerve tissues in the cerebellum, as seen in a vertical section. Origin: L, tree of life. Source: Websters Dictionary (01 Mar 1998) |
| arbor vitae uteri | The two longitudinal ridges, anterior and posterior, in the mucous membrane lining the cervix uteri, from which numerous secondary folds, or rugae, branch off. Synonym: plicae palmatae, arbor vitae uteri, lyra uterina. (05 Mar 2000) |
| arnold-chiari deformity | A congenital anomaly in which the cerebellum and medulla oblongata, which is elongated and flattened, protrude down into the spinal canal through the foramen magnum. It may be associated with many other defects, including spina bifida occulta and meningomyelocele. (12 Dec 1998) |
| arnold-chiari malformation | <radiology> Chiari I herniation of medulla and cerebellar tonsils, 4th ventricle in normal position, Chiari II herniation of medulla, tonsils, vermis, 4th ventricle at foramen magnum, myelomeningocele, aqueductal stenosis most likely to be hydrocephalus, Chiari III further herniation, 4th ventricle below foramen magnum, encephalocele or myelomeningocele associated with: agenesis of corpus callosum, syrinx (12 Dec 1998) |
| Arnold-Chiari syndrome | <radiology> Chiari I herniation of medulla and cerebellar tonsils, 4th ventricle in normal position, Chiari II herniation of medulla, tonsils, vermis, 4th ventricle at foramen magnum, myelomeningocele, aqueductal stenosis most likely to be hydrocephalus, Chiari III further herniation, 4th ventricle below foramen magnum, encephalocele or myelomeningocele associated with: agenesis of corpus callosum, syrinx (12 Dec 1998) |
| Arnold, Freidrich | <person> German anatomist, 1803-1890. See: Arnold's bundle, Arnold's canal, Arnold's ganglion, Arnold's nerve, Arnold's tract, foramen of Arnold. (05 Mar 2000) |
| Arnold, Julius | <person> German pathologist, 1835-1915. See: Arnold's bodies, Arnold-Chiari deformity, Arnold-Chiari malformation, Arnold-Chiari syndrome. (05 Mar 2000) |
| Arnold's bodies | Small portions or minute fragments of erythrocytes (sometimes mistaken for blood platelets), or small "ghosts" of erythrocytes. (05 Mar 2000) |
| Arnold's bundle | A fibre group originating in the cerebral cortex of the temporal lobe, particularly the superior and middle temporal gyri, following the sublenticular limb of the internal capsule into the lateral margin of the crus cerebri in which it descends to its termination in the pontine nuclei or the ventral part of the pons. Synonym: tractus temporopontinus, Arnold's bundle, Arnold's tract. (05 Mar 2000) |
| Arnold's canal | <anatomy, nerve> The small opening in the petrous bone lateral to the hiatus of facial canal that gives passage to the lesser petrosal nerve. Synonym: hiatus canalis nervi petrosi minoris, Arnold's canal, canalis nervi petrosi superficialis minoris. (05 Mar 2000) |
| Arnold's ganglion | An autonomic ganglion situated below the foramen ovale medial to the mandibular nerve; its postganglionic, parasympathetic fibres are distributed to the parotid gland. Synonym: ganglion oticum, Arnold's ganglion, auricular ganglion, otoganglion. (05 Mar 2000) |
| Arnold's nerve | <anatomy, nerve> A branch of the superior ganglion of the vagus, supplying the back of the pinna and the external acoustic meatus. Synonym: ramus auricularis nervi vagi, Arnold's nerve. (05 Mar 2000) |
| Arnold's tract | A fibre group originating in the cerebral cortex of the temporal lobe, particularly the superior and middle temporal gyri, following the sublenticular limb of the internal capsule into the lateral margin of the crus cerebri in which it descends to its termination in the pontine nuclei or the ventral part of the pons. Synonym: tractus temporopontinus, Arnold's bundle, Arnold's tract. (05 Mar 2000) |
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