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 …

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 …

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 …

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 …

There are five deep tendon reflexes and a number of superficial and visceral reflexes covered here.

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 …

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 …

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) …

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 …

The patellar reflex or knee-jerk is a stretch reflex. Striking the patellar tendon with a tendon hammer just below the patella stretches the quadriceps tendon.