| trigeminal nucleus, spinal | Nucleus of the spinal tract of the trigeminal nerve. It is divided cytoarchitectonically into three parts: oralis, caudalis (trigeminal caudal nucleus), and interpolaris. (12 Dec 1998) |
|---|---|
| trigeminal pulse | A pulse in which the beats occur in trios, a pause following every third beat. Synonym: pulsus trigeminus. (05 Mar 2000) |
| trigeminal rhizotomy | Division or section of a sensory root of the fifth cranial nerve, accomplished through a subtemporal (Frazier-Spiller operation), suboccipital (Dandy operation), or transtentorial approach. Synonym: retrogasserian neurectomy, retrogasserian neurotomy. (05 Mar 2000) |
| trigeminal rhythm | A cardiac arrhythmia in which the beats are grouped in trios, usually composed of a sinus beat followed by two extrasystoles. Synonym: trigeminy. (05 Mar 2000) |
| trigeminal system | <neurology> Neurons associated with the fifth or trigeminal nerve, the largest cranial nerve. The trigeminal system provides sensory innervation to the face and mucous membrane of the oral cavity, along with motor innervation to the muscles of mastication. It is called trigeminal because it has three major peripheral branches, the opthalmic, the maxillary and the mandibular nerves. (18 Nov 1997) |
| trigeminal tractotomy | Division of the descending fibres of the trigeminal tract in the medulla. Synonym: intramedullary tractotomy, Sjoqvist tractotomy. (05 Mar 2000) |
| trigeminofacial reflex | Contraction of the orbicularis oculi muscle induced by tapping the supraorbital nerve. Synonym: McCarthy's reflexes, trigeminofacial reflex. (05 Mar 2000) |
| trigeminothalamic tract | General term designating projections from the spinal trigeminal and principal sensory nuclei of the trigeminal nerve to the thalamus; divided into a ventral trigeminothalamic tract (spinal trigeminal nucleus projections to the contralateral ventral posteromedial nucleus-VPM) and a dorsal trigeminothalamic tract (principal sensory nucleus projections to the ipsilateral VPM). See: trigeminal lemniscus. (05 Mar 2000) |
| trigeminus | Synonym: trigeminal. Origin: L. Threefold, fr. Tri-+ geminus, twin (05 Mar 2000) |
| trigeminy | Synonym: trigeminal rhythm. Origin: L. Trigeminus, threefold (05 Mar 2000) |
| trigenic | <chemistry> Of, pertaining to, or designating, an acid, C4H7N3O2, obtained, by the action of the vapor of cyanic acid on cold aldehyde, as a white crystalline substance having a slightly acid taste and faint smell. Synonym: ethidene- or ethylidene-biuret. Origin: Pref. Tri- + gen- + -ic. So named in reference to its composition, it being supposed to contain the radicals of three molecules of cyanic acid. Source: Websters Dictionary (01 Mar 1998) |
| trigenolline | N-methylnicotinic acid;the methyl betaine of nicotinic acid; a product of the metabolism of nicotinic acid; excreted in the urine. Synonym: caffearine, trigenolline. (05 Mar 2000) |
| trigesimo-secundo | Having thirty-two leaves to a sheet; as, a trigesimo-secundo form, book, leaf, size, etc. Origin: L. In trigesimo-secundo in the thirty-second. Source: Websters Dictionary (01 Mar 1998) |
| trigger | 1. A catch to hold the wheel of a carriage on a declivity. 2., the part of a lock which is moved by the finger to release the cock and discharge the piece. <zoology> Trigger fish, a large plectognath fish (Balistes Carolinensis or B. Capriscus) common on the southern coast of the United States, and valued as a food fish in some localities. Its rough skin is used for scouring and polishing in the place of sandpaper. Synonym: leather jacket, and turbot. Origin: For older tricker, from D. Trekker, fr. Trekken to draw, pull. See Trick. Source: Websters Dictionary (01 Mar 1998) |
| trigger area | A specific point or area where, if stimulated by touch, pain, or pressure, a painful response will be induced. Synonym: dolorogenic zone, trigger area, trigger zone. (05 Mar 2000) |