Fill in the Blanks The Patellar ReflexOnline version Complete the paragraph to explain why the patellar reflex is involuntary and immediate. by Sara Beck-Pancer 1 involuntary motor contract not communicates synapses sensory brain INSTRUCTIONS : Click on the words IN THE CORRECT ORDER to complete the paragraph . In a simple reflex , the sensory neuron directly on the motor neuron in the spinal cord . The neuron directly with the neuron , which causes the muscle to . The sensory signal does not have to travel all the way to the , and the motor signal is generated in the brain . All the action happens right in the spinal cord , which is why the reflex is and immediate .