| 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 |
neck rigidity (경부 경직
| 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) |
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| 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) |
| rectolaryngeal reflex | Laryngeal spasm precipitated by stretching the anal sphincter. (05 Mar 2000) |
| masseter 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) |
| vesical reflex | Contraction of the walls of the bladder and relaxation of the trigone and urethral sphincter in response to a rise in pressure within the bladder; the reflex can be voluntarily inhibited and the inhibition readily abolished to control micturition. Synonym: bladder reflex, urinary reflex, vesical reflex. (05 Mar 2000) |
| mass reflex | In cases of gross injury to the spinal cord, as the stage of reflex activity follows the primary flaccidity of the shock, a condition arises in which a strong stimulus to any part of one of the paralysed limbs will be followed by contraction of the hip, knee, and ankle of the same side and often, when the stimulus is applied to the middle line of the body, of both sides, as well as of the abdominal wall, and even evacuation of the bladder and sweating over an area corresponding to the level of the lesion. (05 Mar 2000) |
| red reflex | A triangular area at the anterior inferior part of the tympanic membrane, running from the umbo to the periphery, where there is seen a bright reflection of light. Synonym: cone of light, light reflex, Politzer's luminous cone, red reflex, Wilde's triangle. Malacarne's pyramid, a lobule on the undersurface of the cerebellum, the posterior portion of the vermis. (05 Mar 2000) |
| Gifford's 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) |
| vestibular ocular reflex | <clinical sign> Reflex movement of the eyes in the opposite direction to that which the head is moved, e.g., the eyes being lowered as the head is raised, and the reverse (Cantelli's sign); an indication of functional integrity of the brainstem tegmental pathways and cranial nerves involved in eye movement. Synonym: vestibular ocular reflex. (05 Mar 2000) |
| vestibulospinal reflex | The influence of vestibular stimulation on body posture. (05 Mar 2000) |
| reflex | 1. <anatomy> Reflected. 2. <neurology, physiology> A reflected action or movement, the sum total of any particular involuntary activity. (18 Nov 1997) |
| reflex, abdominal | Contractions of the abdominal muscles upon stimulation of the skin (superficial abdominal reflex) or tapping neighboring bony structures (deep abdominal reflex). The superficial reflex may be weak or absent, for example, after a stroke, a sign of upper (suprasegmental) motor neuron lesions. (12 Dec 1998) |
| reflex, abnormal | Abnormal, involuntary response to a stimulus which includes hyperreflexia, hyporeflexia, and areflexia. (12 Dec 1998) |
| reflex, acoustic | Intra-aural contraction of tensor tympani and stapedius in response to sound. (12 Dec 1998) |