biceps reflex
noun
variants:
or biceps jerk
Medical Definition of biceps reflex
: an involuntary contraction of the biceps muscle of the arm produced by tapping upon its tendon
The biceps reflex is usually tested by percussing the examiner's thumb held over the biceps tendon, with the elbow in a partially flexed position.— Frank P. Smith, Neurology and Neurosurgery, 2001