pronation and adduction of the hand caused by tapping the styloid process of the ulna.
Synonym(s): pronator reflex
Etymology: L, pronare + reflectere, to bend back
a reflex elicited by holding the patient's hand vertically and tapping the distal end of the radius or ulna, resulting in pronation of the forearm. Hyperactivity of the reflex may be seen with lesions of the pyramidal system above the level of the sixth cervical nerve root. Also called ulnar reflex.