This abnormal reflex is typically a sign of an upper motor neuron lesion. These neurons originate in the brain's cerebral ...

Deep-tendon reflexes to be examined are at the elbow (biceps and triceps), wrist (brachioradialis), knee (quadriceps), and ankle (gastrocnemius), and the presence or absence of clonus is noted.

In legs, test rapidity and range of foot tapping (slowed in Parkinson's disease and spasticity) and for clonus (brisk passive extensions of ankle). A sensitive test for spasticity is the Trömner ...

Such children are likely to exhibit hyperreflexia, clonus, co-contraction and a velocity-dependent resistance to passive joint motion. Children who exhibit ‘dynamic’ calf shortening may walk on their ...