Chapter 44 - Neurons, Glia, and Nervous Systems - 44.4 - Neurons and Glia Form Information-Processing Circuits - 44.4 Recap - Learning Outcomes - Page 957: 2

A spinal reflex network includes a sensory neuron, a motor neuron and the central nervous system. An example would be the knee-jerk reflex, where stimulation of the knee results in an involuntary jerking motion. This occurs as a sensory neuron brings the impulse to the brain, which relays the signal to the motor neuron causing a twitch. Since muscles are often complementary (biceps and triceps, for example), a single signal may cause contraction in one muscle and relaxation in another muscle.

A spinal reflex network includes a sensory neuron, a motor neuron and the central nervous system. An example would be the knee-jerk reflex, where stimulation of the knee results in an involuntary jerking motion. This occurs as a sensory neuron brings the impulse to the brain, which relays the signal to the motor neuron causing a twitch. Since muscles are often complementary (biceps and triceps, for example), a single signal may cause contraction in one muscle and relaxation in another muscle.