Patellar reflex - Wikipedia
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 …
Knee-jerk reflex | Muscle contraction, Nerve Impulses, Reflex Arc ...
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 …
Patellar Reflexes: What They Are & Why Doctors Test Them
Jul 27, 2025 · The patellar reflex begins when a healthcare professional taps the patellar tendon, located just below the kneecap, with a reflex hammer. This tap stretches the quadriceps muscle, activating …
Reflex Exam (Deep Tendon Reflexes) - Stanford Medicine 25
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 …
Patellar Reflex Definition - Anatomy and Physiology I Key Term
The patellar reflex, also known as the knee-jerk reflex, is a monosynaptic spinal reflex that evaluates the integrity of the L2-L4 spinal cord segments and the femoral nerve. It is one of the most commonly …
Patellar Reflex Test Explained Easily | OrthoFixar
Dec 5, 2025 · 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 …
Frontiers | Assessing neuromuscular system via patellar tendon reflex ...
Jan 30, 2025 · Reflexes were elicited by striking the patellar tendon, and participants were grouped based on age, height, weight, and gender. We investigated both the individual and combined effects …
Assessment of Patellar and Achilles Reflexes
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.
Patellar reflex - Oxford Reference
Dec 31, 2025 · This is a test of the connection between the sensory nerves attached to stretch receptors in the muscle, the spinal cord, and the motor neurons running from the cord to the thigh muscle, all of …
Understanding The Knee Jerk Reflex: The Role Of The Patellar Tendon …
Oct 1, 2025 · The knee jerk reflex, also known as the patellar reflex, is primarily caused by the contraction of the quadriceps muscle, specifically the rectus femoris. This reflex is elicited when the …