| uncal herniation | <neurology> A condition that occurs when the brain is under abnormally increased pressure. The increased intracranial pressure forces the brain downward inside the skull. This results in typical neurologic manifestations (coma, paralysis and a unilateral dilated pupil). May occur secondary to head injury, primary or metastatic brain tumour, bacterial meningitis and brain abscess. Brain herniations may involve different portions of the brain such as the cerebellum (cerebellar herniation), uncus (uncal herniation) and transtentorial herniation of the cerebrum. (27 Sep 1997) |
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| uncertain | 1. Not certain; not having certain knowledge; not assured in mind; distrustful. "Man, without the protection of a superior Being, . . . Is uncertain of everything that he hopes for." (Tillotson) 2. Irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze. "O woman! in our hours of ease, Uncertain, coy, and hard to please!" (Sir W. Scott) 3. Questionable; equivocal; indefinite; problematical. "The fashion of uncertain evils." "From certain dangers to uncertain praise." (Dryden) 4. Not sure; liable to fall or err; fallible. "Soon bent his bow, uncertain in his aim." (Dryden) "Whistling slings dismissed the uncertain stone." (Gay) Synonym: See Precarious. Origin: Pref. Un- + certain. Cf. Incertain. Source: Websters Dictionary (01 Mar 1998) |
| unci | Plural of uncus. (05 Mar 2000) |
| uncia | Origin: L. See Ounce a measure of weight. 1. A twelfth part, as of the Roman as; an ounce. 2. <mathematics> A numerical coefficient in any particular case of the binomial theorem. Source: Websters Dictionary (01 Mar 1998) |
| unciform | Having the shape of a hook; being of a curved or hooked from; hooklike. <anatomy> Unciform bone, a bone of the carpus at the bases of the fourth and fifth metacarpals; the hamatum. Origin: L. Uncus a hook. <anatomy> The unciform bone. Source: Websters Dictionary (01 Mar 1998) |
| unciform bone | The bone on the medial (ulnar) side of the distal row of the carpus; it articulates with the fourth and fifth metacarpal, triquetral, lunate, and capitate. Synonym: os hamatum, hamatum, hooked bone, unciform bone, unciforme, uncinatum. (05 Mar 2000) |
| unciform fasciculus | A band of long association fibres reciprocally connecting the frontal and temporal lobes of the cerebrum, running caudally through the white matter of the frontal lobe, sharply curving ventrally under the stem of the sylvian fissure, and then fanning out to the cortex of the anterior half of the superior and middle temporal gyri. Synonym: fasciculus uncinatus, arcuate fasciculus, frontotemporal tract, hooked fasciculus, temporofrontal tract. (05 Mar 2000) |
| unciforme | Synonym: hamate bone. Origin: Mod. L. Unciform (05 Mar 2000) |
| Uncinaria | A genus of nematode hookworms that infect various mammals. Species include Uncinaria stenocephala, the European hookworm of dogs, cats, and various wild carnivores, also found in North America, where it is much less common than Ancylostoma caninum, though it has been implicated in human cutaneous larva migrans. Origin: LL. Uncinus, a hook (05 Mar 2000) |
| uncinariasis | Infection of humans or animals with hookworms of the genus ancylostoma. Characteristics include anaemia, dyspepsia, eosinophilia, and abdominal swelling. (12 Dec 1998) |
| uncinata | <zoology> A division of marine chaetopod annelids which are furnished with uncini, as the serpulas and sabellas. Origin: NL, fr. L. Uncinus a hook. Source: Websters Dictionary (01 Mar 1998) |
| uncinate | Terminating in a hooked point. (09 Oct 1997) |
| uncinate attack | A form of psychomotor epilepsy or complex partial seizure initiated by a dreamy state and hallucinations of smell and taste, usually the result of a medial temporal lesion. Synonym: uncinate attack. (05 Mar 2000) |
| uncinate bundle of Russell | Fastigial efferent fibres that cross with the cerebellum and descend over the lateral surface of the superior cerebellar peduncle; these fibres largely terminate in the vestibular nuclei and the reticular formation of the pons and medulla. Synonym: hooked bundle of Russell, uncinate fasciculus of Russell. (05 Mar 2000) |
| uncinate epilepsy | A form of psychomotor epilepsy or complex partial seizure initiated by a dreamy state and hallucinations of smell and taste, usually the result of a medial temporal lesion. Synonym: uncinate attack. (05 Mar 2000) |