| SLR | Shwartzman local reaction; single lens reflex; straight leg raising |
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| SPAR | sensitivity prediction by acoustic reflex |
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |
| STNR | symmetric tonic neck reflex |
| TF | free thyroxine; tactile fremitus; tail flick [reflex]; temperature factor; testicular feminization; ... |
| Brain's reflex | Extension of the arm of a hemiplegic patient when turned prone as if on all fours. Synonym: Brain's reflex. (05 Mar 2000) |
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| bregmocardiac reflex | In infants, pressure upon the anterior fontanelle causing cardiac slowing. (05 Mar 2000) |
| Brissaud's reflex | Tickling the sole causes a contraction of the tensor fasciae latae muscle, even when there is no responsive movement of the toes. (05 Mar 2000) |
| bulbocavernosus reflex | A sharp contraction of the bulbocavernosus and ischiocavernosus muscles when the glans penis is suddenly compressed or tapped. (05 Mar 2000) |
| bulbomimic 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) |
| Capps' reflex | An obsolete eponym for vasomotor collapse at the time of crisis in pneumonia. (05 Mar 2000) |
| cardiac depressor reflex | A fall in blood pressure due to peripheral vasodilation and cardiac inhibition by stimulations of terminations of a cardiac depressor nerve in the aortic arch and base of the heart. Synonym: aortic reflex, depressor reflex. (05 Mar 2000) |
| gag reflex | Contact of a foreign body with the mucous membrane of the fauces causes retching or gagging. Synonym: faucial reflex. (05 Mar 2000) |
| radial reflex | On tapping the lower end of the radius, flexion of the forearm occurs, and sometimes, on strong percussion, flexion of the fingers. See: inverted radial reflex. (05 Mar 2000) |
| Galant's reflex | A deep abdominal reflex in which there is a contraction of the abdominal muscles on tapping the anterior superior iliac spine. Synonym: lower abdominal periosteal reflex. (05 Mar 2000) |
| vagovagal reflex | Bradycardia with arterial hypotension, often with supraventricular arrhythmias; ascribed to stimulation, especially mechanical, of afferent vagal pathways in the abdomen, thorax, or airway, the efferent arc being vagal cardioinhibitory fibres. (05 Mar 2000) |
| galvanic skin reflex | A change in electrical resistance of the skin, occurring in emotion and in certain other conditions. (12 Dec 1998) |
| radiobicipital reflex | Contraction of the biceps muscle which sometimes occurs in the elicitation of the brachioradial reflex. (05 Mar 2000) |
| palatal reflex | Swallowing reflex induced by stimulation of the palate. (05 Mar 2000) |
| radioperiosteal reflex | With the arm supinated to 45 |