Patellar reflexes refer to the involuntary rapid contraction of the quadriceps muscle when the patellar tendon is tapped with a reflex hammer. These reflexes are also known as knee-jerk reflexes, patellar tendon reflexes, or deep tendon reflexes. The term "myotactic reflex" is also used to describe this phenomenon as it reflects the muscle's tendency to contract in response to its own stretch. In clinical settings, physicians use these reflexes as a diagnostic tool to evaluate the condition of the nervous system. The patellar reflexes are commonly tested during physical examinations to detect any underlying neurological abnormalities that may be present.