Question

Which nerve is responsible for Knee-jerk?

Answer 1

1. A hard tap on the patellar tendon right below the kneecap causes the patellar reflex, also known as the knee-jerk reaction.
2. Knee-jerk is a rapid lower-leg kicking movement.
3. The patellar reflex is a test of the spinal cord's L2, L3, and L4 segments.
4. Although the L3 and L4 nerve roots control the knee jerk reaction, L5 radiculopathy has been linked to changes in knee jerk expression.
5. The patellar reflex, also known as the knee-jerk reaction, is a rapid kicking movement of the lower leg in response to a strong tap on the patellar tendon just below the kneecap.
6. The quadriceps muscle is strained when the patellar tendon is tapped, prompting the muscle's sensory receptor, known as a spindle fibre, to send a signal to the spinal cord through the afferent neuron.
7. The quadriceps muscle contracts and elevates the lower leg as a result of the efferent neuron's input.