| SGR | Sachs-Georgi reaction; Shwartzman generalized reaction; skin galvanic reflex; submandibular gland re... |
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| SLR | Shwartzman local reaction; single lens reflex; straight leg raising |
| SPAR | sensitivity prediction by acoustic reflex |
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |
| STNR | symmetric tonic neck reflex |
Preyer's test (프라이어 시험
radioisotope vesicoureteral reflex test
| gastroileac reflex | Opening of the ileocolic valve induced by entrance of food into the stomach. (05 Mar 2000) |
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| Geigel's reflex | In the female, a contraction of the muscular fibres at the upper edge of Poupart's ligament on gently stroking the inner side of the thigh; analogue of the cremasteric reflex in males. (05 Mar 2000) |
| mandibular 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) |
| parachute reflex | The reflex response of an infant (contraction of the limb and neck muscles) when allowed to drop a short distance through the air or startled by a sudden noise or jolt. Synonym: Moro reflex, parachute reflex, startle reaction. Synonym: cochleopalpebral reflex. (05 Mar 2000) |
| paradoxical extensor 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) |
| paradoxical flexor reflex | Dorsal flexion of the great toe produced by firm lateral pressure on the calf muscles. Synonym: paradoxical flexor reflex. (05 Mar 2000) |
| paradoxical patellar reflex | A tap on the patellar tendon causes contraction of the adductor, sudden passive extension of the leg causes a contraction of the extensor muscles of the leg. (05 Mar 2000) |
| paradoxical pupillary reflex | A pupillary response to light, the reverse of that expected; e.g., contraction of the pupil in response to turning the lights off. Synonym: Flynn phenomenon, paradoxical pupillary phenomenon. (05 Mar 2000) |
| paradoxical 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) |
| paradoxical triceps reflex | Flexion of the forearm caused by tapping the olecranon. Synonym: paradoxical triceps reflex. (05 Mar 2000) |
| venorespiratory reflex | Stimulation of respiration and increased pulmonary ventilation in response to an increase in pressure in the right atrium. (05 Mar 2000) |
| carotid sinus reflex | A normal reflex relating to the carotid sinus syndrome, which results from hypersensitivity or hyperactivation of the carotid sinus. (05 Mar 2000) |
| vertebra prominens reflex | Pressure upon the last cervical vertebra of an animal, especially of one whose labyrinths have been destroyed and the vestibular nuclei isolated, causes relaxation or reduced tone of all four limbs. (05 Mar 2000) |
| rectal reflex | The entrance of faecal matter into the rectum from the sigmoid colon causes an impulse to defecate. (05 Mar 2000) |
| rectocardiac reflex | A parasympathetic reflex producing bradycardia and hypotension upon stimulation of the pelvic nerve, the afferent limb being the sacral outflow of the parasympathetic division of the autonomic nervous system, and the efferent limb, the cardiac vagus; said to accompany proctologic examinations. (05 Mar 2000) |