controls a third set of neurons in the jaw: These final nerve cells direct the movements needed for chewing. The three-part circuit acts like a reflex, without needing conscious thought to direct ...

Relay neurons connect sensory neurons to motor ... requires a nerve impulse to be sent to the motor neuron of the reflex arc to interfere with the normal reflex action to drop the object.

It is caused by the disruptions of signals from nerve cells of the spinal cord (called motor neurons) to skeletal ... symptom that can be detected with a reflex hammer. Other tests may be ordered ...