Figure 2-5. Reflex arc.
a. The stimulus is received by a receptor organ specific to that stimulus.
b. The information is transmitted to the CNS by the afferent neuron of the
appropriate peripheral nerve.
c. Within the spinal cord, the afferent neuron synapses with a special connecting
neuron called the internuncial neuron (or interneuron).
d. In turn, the internuncial neuron synapses with the efferent neuron's cell body.
The axon of the efferent neuron carries the information to the effector organ.
e. The effector organ receives the command to act.
2-10. THE AUTONOMIC NERVOUS SYSTEM
a. The ANS is the portion of the nervous system concerned with innervation of
smooth muscle, cardiac muscle and the glands. The ANS regulates visceral activities