Geigels reflex, also known as the patellar reflex, is a neurological response characterized by an involuntary contraction of the quadriceps muscle when the patellar tendon is tapped, triggering a reflex contraction of the leg. This reflex plays a crucial role in assessing the integrity of the spinal cord and peripheral nerves. While "Geigels reflex" is the commonly used term, there are several synonyms that refer to the same phenomenon. These include the knee-jerk reflex, patellar reflex, quadriceps reflex, myotatic reflex, or monosynaptic reflex. Regardless of the synonym used, this reflex serves as an essential diagnostic tool in evaluating the functioning of the central and peripheral nervous systems.