| 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) |
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| 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) |
| Strumpell's reflex | Stroking the abdomen or thigh causes flexion of the leg and adduction of the foot. (05 Mar 2000) |
| styloradial reflex | With the arm supinated to 45 |
| nociceptive reflex | Flexion of ankle, knee, and hip when the foot is painfully stimulated; the crossed extension reflex occurs in association with it. Synonym: defense reflex, nociceptive reflex, withdrawal reflex. (05 Mar 2000) |