The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord. Many animals, most significantly humans, have been seen to have …

The reflex exam is fundamental to the neurological exam and important to locating upper versus lower motor neuron lesions. There are five deep tendon reflexes and a number of superficial and visceral …

In this work, we develop a device specifically designed to induce the patellar reflex and measure the angle and angular velocity of the leg during the course of the reflex test.

In this lab, students will determine the response time, conduction velocity (speed), and amplitude (strength) of two stretch reflexes: the Achilles reflex at the ankle and the patellar (knee-jerk) reflex.

Jul 27, 2025 · The patellar reflex, commonly known as the knee-jerk reflex, is a widely recognized example. It illustrates how the nervous system maintains bodily functions without direct brain input.

The patellar reflex is contraction of the quadriceps femoris muscle, with resulting extension of the knee, in response to percussion of the patellar tendon. A firm tap on the tendon draws the patella down, …

One of the several positions that a subject may take for the test is to sit with knees bent and with one leg crossed over the other so that the upper foot hangs clear of the floor. The sharp tap on the tendon …

Nov 8, 2025 · Understanding the patellar reflex? Learn which muscles relax during the knee-jerk response and how this reflex works in the body.

The patellar reflex is a monosynaptic spinal reflex that involves the L2-L4 spinal cord segments and the femoral nerve. When the patellar tendon is tapped, it stimulates sensory receptors that send an …

Oct 17, 2025 · The knee jerk reflex, or patellar reflex, is a cornerstone of any comprehensive neurological examination. It’s more than just a tap on the knee; it’s a window into the integrity of your …