| TTR | transthoracic resistance; transthyretin; triceps tendon reflex |
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| TVR | tonic vibratory reflex; total vascular resistance; tricuspid valve replacement |
| UR | unconditioned reflex; upper respiratory; uridine; urinal; urology; utilization review |
| VOR | vestibulo-ocular reflex; volume of regret |
| VRR | ventral root reflex |
| costopectoral reflex | Contraction of the pectoralis major muscle elicited by tapping the seventh rib between the anterior and the medial axillary lines while the arm is abducted; contraction of the deltoid and biceps may also occur. Synonym: costopectoral reflex. (05 Mar 2000) |
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| cough reflex | <chest medicine, neurology, physiology> The reflex which mediates coughing in response to irritation of the larynx or tracheobronchial tree. Synonym: laryngeal reflex. (05 Mar 2000) |
| myotatic 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) |
| craniocardiac reflex | Stimulation of nerve endings of certain cranial nerves (e.g., olfactory, ophthalmic branch of trigeminal), with resultant cardiac depressor reflex, manifested by bradycardia and hypotension, through the cardiac branch of the vagus. (05 Mar 2000) |
| cremasteric reflex | A drawing up of the scrotum and testicle of the same side when the skin over Scarpa's triangle or on the inner side of the thigh is scratched. (05 Mar 2000) |
| crossed adductor reflex | Contraction of the adductors of the thigh and inward rotation of the limb elicited by tapping the sole. Synonym: crossed adductor jerk. (05 Mar 2000) |
| crossed extension reflex | Extension of the contralateral hind limb when the paw of an animal is painfully stimulated or the central cut end of an afferent nerve, e.g., the peroneal, is stimulated; sometimes occurs in humans upon tapping the skin. (05 Mar 2000) |
| crossed knee reflex | Contraction of the contralateral quadriceps when a patellar reflex is elicited. Synonym: crossed knee jerk. (05 Mar 2000) |
| crossed reflex | A reflex movement on one side of the body in response to a stimulus applied to the opposite side. Synonym: crossed jerk. (05 Mar 2000) |
| crossed reflex of pelvis | Contraction of the contralateral adductors of the thigh upon tapping the anterior superior iliac spine. Synonym: crossed spino-adductor reflex. (05 Mar 2000) |
| crossed spino-adductor reflex | Contraction of the contralateral adductors of the thigh upon tapping the anterior superior iliac spine. Synonym: crossed spino-adductor reflex. (05 Mar 2000) |
| cry reflex | A sudden unconscious cry, during sleep, in a child with hip disease, long bone fractures, or other painful conditions of the extremities, elicited by movement of muscles that have relaxed after prolonged muscle spasms. (05 Mar 2000) |
| cuboidodigital reflex | Flexion of the toes on tapping over the cuboid bone; almost identical with Guillain-Barre reflex, and fundamentally similar to Rossolimo's reflex. Synonym: metatarsal reflex. (05 Mar 2000) |
| postural reflex | Responses that control the position of the trunk and extremities. See: righting reflexes. Synonym: static reflexes. (05 Mar 2000) |
| cutaneous pupil 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) |