| snapping 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) |
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| snout reflex | Pouting or pursing of the lips induced by light tapping of closed lips near the midline; seen in defective pyramidal innervation of facial musculature. (05 Mar 2000) |
| sole 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) |
| sole tap 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) |
| spinal reflex | A reflex arc involving the spinal cord. See: reflex arc. (05 Mar 2000) |
| spino-adductor reflex | Contraction of the adductors of the thigh upon tapping the spinal column. Synonym: McCarthy's reflexes. (05 Mar 2000) |
| nasal reflex | Sneezing caused by irritation of the nasal mucous membrane. (05 Mar 2000) |
| nasomental reflex | Contraction of the mentalis muscle following a tap on the side of the nose. (05 Mar 2000) |
| near reflex | Pupillary constriction with a near vision effort, with ocular convergence, or with accommodation; an associated reaction, not a true reflex. (05 Mar 2000) |
| Starling's reflex | Tapping the volar surfaces of the fingers causes flexion of the fingers; analogous to Rossolimo's reflex, for the toes. (05 Mar 2000) |
| startle 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) |
| statokinetic reflex | A reflex which, through stimulation of the receptors in the neck muscles and saemicircular canals, brings about movements of the limbs and eyes appropriate to a given movement of the head in space. (05 Mar 2000) |
| stepping reflex | If the plantar surface of a hind foot of a dog is pressed gently, a movement of extension of the limb will follow, accompanied sometimes by flexion of the opposite hind limb. (05 Mar 2000) |
| sternobrachial reflex | Contraction of the adductors of the arm when the sternum is tapped. (05 Mar 2000) |
| stretch reflex | Tonic contraction of the muscles in response to a stretching force, due to stimulation of muscle proprioceptors. Synonym: Liddell-Sherrington reflex, muscular reflex, stretch reflex. (05 Mar 2000) |