| TTR | transthoracic resistance; transthyretin; triceps tendon reflex |
|---|---|
| TVR | tonic vibratory reflex; total vascular resistance; tricuspid valve replacement |
| UR | unconditioned reflex; upper respiratory; uridine; urinal; urology; utilization review |
| VOR | vestibulo-ocular reflex; volume of regret |
| VRR | ventral root reflex |
| innate reflex | An unlearned or instinctive reflex such as sucking, which is present at birth. (05 Mar 2000) |
|---|---|
| interscapular reflex | Contraction of the upper muscles of the back by stimulation between the scapulae. Synonym: interscapular reflex. (05 Mar 2000) |
| intrinsic reflex | A reflex muscular contraction elicited by the application of a stimulus, usually stretching, to the muscle itself as opposed to a muscular contraction caused by an extrinsic stimulus, e.g., skin, as in the abdominal skin reflex's. (05 Mar 2000) |
| inverted radial reflex | Flexion of the fingers without flexion of the forearm, on tapping the lower end of the radius; regarded as indicating a lesion of the fifth cervical segment of the spinal cord. (05 Mar 2000) |
| inverted reflex | Any reflex in which the usual response is reversed or does not conform to the pattern characteristic of the particular reflex. Synonym: inverted reflex. (05 Mar 2000) |
| investigatory reflex | An aspect of attending in which an organism's initial response to a change or to a novel stimulus is such that the organism becomes more sensitive to the stimulation; e.g., dilation of the pupil of the eye in response to dim light. Synonym: investigatory reflex, orienting response. (05 Mar 2000) |
| ipsilateral reflex | A reflex in which the response occurs on the side of the body that is stimulated. (05 Mar 2000) |
| oculocardiac reflex | A decrease in pulse rate associated with traction on extraocular muscles or compression of the eyeball; especially sensitive in children; may produce asystolic cardiac arrest. Synonym: Aschner's phenomenon, Aschner's reflex, Aschner-Dagnini reflex, oculovagal reflex. (05 Mar 2000) |
| oculocephalic reflex | Turning of the eyes and head toward the source of an auditory, visual, or other form of stimulation. Synonym: oculocephalic reflex. (05 Mar 2000) |
| oculocephalogyric reflex | Turning of the eyes and head toward the source of an auditory, visual, or other form of stimulation. Synonym: oculocephalic reflex. (05 Mar 2000) |
| oculovagal reflex | A decrease in pulse rate associated with traction on extraocular muscles or compression of the eyeball; especially sensitive in children; may produce asystolic cardiac arrest. Synonym: Aschner's phenomenon, Aschner's reflex, Aschner-Dagnini reflex, oculovagal reflex. (05 Mar 2000) |
| oesophagosalivary reflex | Salivation caused by irritation of the lower end of the oesophagus, as by carcinoma. Synonym: Roger's reflex. (05 Mar 2000) |
| olecranon reflex | Flexion of the forearm caused by tapping the olecranon. Synonym: paradoxical triceps reflex. (05 Mar 2000) |
| Oppenheim's reflex | Extension of the toes induced by scratching of the inner side of the leg or by following sudden flexion of the thigh on the abdomen and the leg on the thigh; a sign of cerebral irritation. (05 Mar 2000) |
| orbicularis oculi reflex | Contraction of the orbicularis oculi muscles upon tapping the margin of the orbit, or the bridge or tip of the nose. Synonym: nose-bridge-lid reflex, nose-eye reflex. (05 Mar 2000) |