13. The Peripheral Nervous System

The lower motor neurons that innervate contractile skeletal muscle fibers are called:

a. α-motor neurons.

b. β-motor neurons.

c. upper motor neurons.

d. γ-motor neurons.

Explain why you lose both motor and sensory function of a part of your body when a spinal nerve is numbed with anesthetic agents.

When Mr. Williams goes to the emergency department with pain in the area along the midline of the diaphragm, he worries he is having a heart attack. Could the pain be related to his heart? Could it be related to any other organ(s)? Explain.