Interneuron sensory neuron sensory receptor Motor neuron Effector Reflex testing is an important diagnostic tool for assessing the condition of the nervous system. Distorted, exaggerated, or absent reflex response may indicate degeneration or pathology of portions the the nervous system Abdominal reflex, achilles reflex, corneal reflex, crossed-extensor reflex, gag reflex, patellar reflex, and plantar reflex Patellar reflex Achilles reflex Plantar reflex Ciliospinal reflex pupillary light reflex Corneal reflex