| supraorbital reflex | Contraction of the orbicularis oculi muscle induced by tapping the supraorbital nerve. Synonym: McCarthy's reflexes, trigeminofacial reflex. (05 Mar 2000) |
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| suprapatellar reflex | The patella rises when a tap is given on the quadriceps tendon above the patella. (05 Mar 2000) |
| supraumbilical reflex | A contraction of the upper portion of the rectus abdominis muscle when the skin of the epigastrium above is scratched. Synonym: supraumbilical reflex. (05 Mar 2000) |
| deglutition reflex | The act of swallowing (second stage) induced by stimulation of the palate, fauces, or posterior pharyngeal wall. Synonym: deglutition reflex, pharyngeal reflex. (05 Mar 2000) |
| Dejerine's reflex | Clonic contractions of the flexors of the hand (wrist) on tapping the dorsum of the hand or the volar side of the forearm near the wrist; occurs in normal persons but is exaggerated in pyramidal tract lesions. Synonym: Dejerine's reflex. (05 Mar 2000) |
| delayed reflex | A reflex in which a little time elapses between stimulus and response. See: trace conditioned reflex. (05 Mar 2000) |
| swallowing reflex | The act of swallowing (second stage) induced by stimulation of the palate, fauces, or posterior pharyngeal wall. Synonym: deglutition reflex, pharyngeal reflex. (05 Mar 2000) |
| sympathetic reflex dystrophy | A syndrome of pain and tenderness, usually to a hand or foot, associated with vasomotor instability, skin changes and rapid development of bony demineralisation (osteoporosis). Frequently will follow a localised trauma, stroke or peripheral nerve injury. (27 Sep 1997) |
| synchronous reflex | Subsidiary reflex actions occurring in association with the main or leading reflex. (05 Mar 2000) |
| syndrome, reflex sympathetic dystrophy | A condition that features a group of typical symptoms, including pain (often burning type), tenderness, and swelling of an extremity associated with varying degrees of sweating, warmth and/or coolness, flushing, discoloration, and shiny skin. (12 Dec 1998) |
| 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) |
| diffused reflex | One of several reflex's occurring in association with the main reflex. (05 Mar 2000) |
| digital 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) |
| diving reflex | A reflex by which immersing the face or body in water, especially cold water, tends to cause bradycardia and peripheral vasoconstriction; mean aortic pressure is little affected because the reduction in cardiac output tends to balance the increased peripheral resistance that reduces peripheral blood flow. Although relatively minor in most humans, the changes can be profound in some diving species of animal, e.g., ducks and seals. (05 Mar 2000) |
| dorsal reflex | Contraction of the muscles of the back elicited by cutaneous stimulation over the erector spinal muscle. (05 Mar 2000) |