| 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 |
| Hering-Breuer reflex | The effects of afferent impulses from the pulmonary vagi in the control of respiration, e.g., inflation of the lungs arrests inspiration with expiration then ensuing, while deflation of the lungs brings on inspiration. (05 Mar 2000) |
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| protective laryngeal reflex | Closure of the glottis to prevent entry of foreign substances into the respiratory tract. (05 Mar 2000) |
| Schaffer's reflex | In cases of injury to the corticospinal tract, the great toe is dorsiflexed when the skin over the Achilles tendon is pinched. (05 Mar 2000) |
| scratch reflex | In dogs, stimulus applied to the skin of a saddle-shaped area of the back, sides, and flanks produces a scratching movement of the hind leg of the side stimulated. (05 Mar 2000) |
| psychocardiac reflex | A change in the circulatory rate and subjective heart consciousness (often "thumping") resulting from a memory of, or a subconscious dream state recollection of, an emotional impression or experience. (05 Mar 2000) |
| psychogalvanic reflex | A change in electrical resistance of the skin, occurring in emotion and in certain other conditions. (12 Dec 1998) |
| Hoffmann's reflex | <clinical sign> In latent tetany mild mechanical stimulation of the trigeminal nerve causes severe pain, flexion of the terminal phalanx of the thumb and of the second and third phalanges of one or more of the fingers when the volar surface of the terminal phalanx of the fingers is flicked. Synonym: digital reflex, Hoffmann's reflex, snapping reflex. (05 Mar 2000) |
| pulmonocoronary reflex | Reflex constriction of the coronary arteries as a result of vagal stimuli arising in the lungs, as in pulmonary embolism. (05 Mar 2000) |
| semimembranosus reflex | Contraction of these muscles by tapping in the region of the tuberosity of the tibia. (05 Mar 2000) |
| pupillary reflex | Change in diameter of the pupil as a reflex response to any type of stimulus; e.g., constriction caused by light. Synonym: light reflex. (05 Mar 2000) |
| pupillary-skin reflex | Dilation of the pupil following scratching of the skin of the neck. Synonym: ciliospinal reflex, cutaneous pupil reflex, cutaneous-pupillary reflex, skin-pupillary reflex. (05 Mar 2000) |
| H reflex | <clinical sign, neurology> A monosynaptic reflex consistently obtained in normal adults only by stimulating the tibial nerve, generally in the popliteal fossa, while recording from the gastrocnemius-soleus muscle group. It is similar to the Achilles reflex, except the neuromuscular spindles are bypassed; widely used in the EMG laboratory to diagnose S1 radiculopathies and polyneuropathies. (05 Mar 2000) |
| shot-silk reflex | The appearance of numerous wavelike, glistening reflexes, like the shimmer of silk, observed sometimes in the retina of a young person. Synonym: shot-silk phenomenon, shot-silk reflex. (05 Mar 2000) |
| sinus reflex | See: carotid sinus syndrome. (05 Mar 2000) |
| hypochondrial reflex | <neurology> A quick inspiration induced by sharp pressure beneath the costal margin. (05 Mar 2000) |