| RRI | recurrent respiratory infection; reflex relaxation index; relative response index |
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| RSD | reflex sympathetic dystrophy; relative standard deviation |
| RSDS | reflex sympathetic dystrophy syndrome |
| SGR | Sachs-Georgi reaction; Shwartzman generalized reaction; skin galvanic reflex; submandibular gland re... |
| SLR | Shwartzman local reaction; single lens reflex; straight leg raising |
| cochleostapedial reflex | Contraction of the stapedius muscle in response to a loud sound; this is a protective reflex which with the reflex contraction of the tensor tympani reduces the amplitude of the vibrations of the tympanic membrane and ossicles. (05 Mar 2000) |
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| coeliac plexus reflex | Arterial hypotension coincident with surgical manipulations in the upper abdomen during general anaesthesia. (05 Mar 2000) |
| Mondonesi's reflex | In a case of coma from severe apoplexy, pressure on the eyeballs causes contraction of the facial muscles of expression on the side opposite to the lesion; if coma due to diabetes, uraemia, or other toxic cause the reflex is present on both sides. Synonym: facial reflex, Mondonesi's reflex. (05 Mar 2000) |
| pilomotor reflex | Contraction of the smooth muscle of the skin resulting in "gooseflesh" caused by mild application of a tactile stimulus or by local cooling. (05 Mar 2000) |
| pinch reflex diode | <radiobiology> A self-insulated ion diode in which the magnetic field from the ion and electron flow alone provide electron control, and the ion source is an anode plasma formed by relexing the electrons through a thin plastic foil. (09 Oct 1997) |
| Weingrow's 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) |
| Westphal's pupillary reflex | A constriction of both pupils when an effort is made to close eyelids forcibly held apart. A variant of the pupil response to near vision. Synonym: Galassi's pupillary phenomenon, Gifford's reflex, lid-closure reaction, orbicularis phenomenon, orbicularis pupillary reflex, Piltz sign, Westphal's pupillary reflex, Westphal-Piltz phenomenon. (05 Mar 2000) |
| Moro 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) |
| white pupillary reflex | Reflection from a white mass within the eye giving the appearance of a white pupil. Synonym: leukokoria, white pupillary reflex. Origin: Leuko-white, + G. Kore, pupil (05 Mar 2000) |
| plantar muscle 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) |
| plantar reflex | The response to tactile stimulation of the ball of the foot, normally plantar flexion of the toes; the pathologic response is Babinski's sign. Synonym: sole reflex. (05 Mar 2000) |
| wink reflex | General term for reflex closure of eyelids caused by any stimulus. Synonym: eye-closure reflex. (05 Mar 2000) |
| withdrawal reflex | Flexion of ankle, knee, and hip when the foot is painfully stimulated; the crossed extension reflex occurs in association with it. Synonym: defense reflex, nociceptive reflex, withdrawal reflex. (05 Mar 2000) |
| conditioned reflex | A reflex that is gradually developed by training and association through the frequent repetition of a definite stimulus. See: conditioning. Synonym: acquired reflex, behaviour reflex, trained reflex. (05 Mar 2000) |
| conjunctival reflex | Closure of the eyes in response to irritation of the conjunctiva. (05 Mar 2000) |