Why Does The Doctor Hit Your Knee?

Reasons Why the Doctor Hits Your Knee 

Do you ever wonder why the doctor hits your knee? There are several reasons, but in the end, it comes down to two main points: reflex arcs and mono-synaptic response. Read on to discover the most important ones. You may have to get a second opinion if this is the case. Listed below are several reasons why you should avoid having the doctor hit your knee. Listed below are three more. 

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a mono-synaptic response 

Did you know that your knee-jerk reflex is a result of a mono-synaptic reflex? It is a natural response that occurs when a doctor hits you in the knee. The knee jerk reflex is a type of proprioception that helps to maintain balance and posture. The doctor will hit you on the knee at the spot just below your knee cap. Your leg will kick out as a result. 

In the knee jerk reflex, the sensory neuron in your quadriceps muscle synapses with an inhibitory interneuron in the spinal cord. It then travels to a muscle fiber located in the hamstrings. The resulting reflex is a mono-synaptic one. The knee jerk reflex is the result of a single synaptic connection between a sensory neuron and a motor neuron in the spinal cord. 

In contrast, the polysynaptic reflex involves more than one synapse. It is a complex reflex that involves multiple connections between neurons in the spinal cord. It involves a single synapse. If a doctor hits your knee, your abdominal muscles will contract, and the jerk causes you to stand up. During a mono-synaptic reflex, the doctor strikes your knee, but the effect is temporary. 

a reflex arc 

Your reflexes occur as a result of connections in the spinal cord and brain. The parts of the reflex arc include the sensor, motor neuron, control center, and muscle. They work together as a relay team to send information from the sensor to the spinal cord and trigger a reflex response. This process is called the reflex arc, and it helps explain how you react when a doctor strikes your knee. 

The patellar reflex is an example of a monosynaptic reflex arc. The sensory neuron that fires the patellar tendon synapses directly with a motor neuron in the spinal cord. An inhibitory interneuron then relaxes the antagonistic hamstring muscle. This response can be influenced if the patient is conscious of inhibiting his response. The doctor may perform the Jendrassik maneuver to make the test more valid. 

A response to pain is another symptom of a neurological disorder. In Parkinson’s disease, the neuron sends a signal to the spinal cord, which in turn sends a signal to the muscle. Prior injuries to the brain or spinal cord can also lead to Parkinson’s disease. When a patient has these symptoms, a reflex test will help determine if a neurological disease is causing the brisk reflex.