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Reflex Arc
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1. The Reflex Arc is initiated artificially by tapping the tendon connected to the quadriceps muscle. 2. Sensors detect a sudden stretch in the quadriceps. 3. Sensory neurons convey the information to the spinal cord. 4. In response to signals from the sensory neurons, motor neurons convey signals to the quadriceps, causing it to contract, and jerking the lower leg forward. 5. Sensory neurons also communicate with interneurons in the spinal cord. 6. The interneurons inhibit motor neurons that lead to the hamstring muscle. This inhbition prevents the contraction of the hamstring, which would resist the action of the quadriceps.
