| UR | unconditioned reflex; upper respiratory; uridine; urinal; urology; utilization review |
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| VOR | vestibulo-ocular reflex; volume of regret |
| VRR | ventral root reflex |
| VUR | vesicoureteral reflex |
| grasp reflex | An involuntary flexion of the fingers to tactile or tendon stimulation on the palm of the hand, producing an uncontrollable grasp; usually associated with frontal lobe lesions. Compare: darwinian reflex. Synonym: forced grasping reflex, grasp reflex. (05 Mar 2000) |
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| chin reflex | A spasmodic contraction of the temporal muscles following a downward tap on the loosely hanging mandible. Synonym: chin jerk, chin reflex, jaw jerk, mandibular reflex, masseter reflex. (05 Mar 2000) |
| great-toe reflex | <clinical sign> Extension of the great toe and abduction of the other toes instead of the normal flexion reflex to plantar stimulation, considered indicative of pyramidal tract involvement ("positive" Babinski). Synonym: Babinski reflex, Babinski's phenomenon, great-toe reflex, paradoxical extensor reflex, toe phenomenon. (05 Mar 2000) |
| metacarpohypothenar reflex | Flexion of the little finger on tapping the dorsum of the hand; seen in pyramidal tract lesions and is similar to Starling's reflex. (05 Mar 2000) |
| metacarpothenar reflex | Flexion of the thumb upon tapping the dorsum of the hand. Synonym: metacarpothenar reflex. (05 Mar 2000) |
| Chodzko's reflex | Contractions of several muscles of the shoulder girdle and arm when the manubrium sterni is percussed. (05 Mar 2000) |
| metatarsal reflex | Flexion of the toes on tapping over the cuboid bone; almost identical with Guillain-Barre reflex, and fundamentally similar to Rossolimo's reflex. Synonym: metatarsal reflex. (05 Mar 2000) |
| Guillain-Barre reflex | Plantar flexion of the foot and toes elicited by tapping the sole near its outer edge; has the same significance as the Rossolimo toe flexion reflex Also called Guillain-Barre, Weingrow's, or sole tap reflex. Synonym: Guillain-Barre reflex, sole tap reflex, Weingrow's reflex. (05 Mar 2000) |
| gustatory-sudorific reflex | Sweating, especially over the face, when chewing food. See: auriculotemporal nerve syndrome. (05 Mar 2000) |
| Roger's reflex | Salivation caused by irritation of the lower end of the oesophagus, as by carcinoma. Synonym: Roger's reflex. (05 Mar 2000) |
| rooting reflex | When the cheek or lip is touched, a newborn baby automatically roots and turns the face toward the stimulus. The rooting reflex helps with breast-feeding. (12 Dec 1998) |
| pharyngeal reflex | The act of swallowing (second stage) induced by stimulation of the palate, fauces, or posterior pharyngeal wall. Synonym: deglutition reflex, pharyngeal reflex. (05 Mar 2000) |
| Rossolimo's reflex | Flicking the tops of the toes from the plantar surface causes flexion of the toes; a stretch reflex of the flexors of the toes seen in lesions of the pyramidal tracts. See: Starling's reflex. Synonym: plantar muscle reflex, Rossolimo's sign. (05 Mar 2000) |
| phasic reflex | A coordinated complex response such as the scratch reflex in the spinal animal. (05 Mar 2000) |
| Phillipson's reflex | A contraction of the extensors of the knee when the extensors of the opposite knee are inhibited. (05 Mar 2000) |