Question

question 9 of 10
the central nervous system consists of the...
spinal nerves and cranial nerves
motor or efferent neurons
brain and spinal cord
autonomic nervous system

Explanation:

To determine the components of the central nervous system (CNS), we analyze each option:

• "Spinal nerves and cranial nerves" are part of the peripheral nervous system (PNS), not the CNS.
• "Motor or efferent neurons" are a type of neuron, not the main components of the CNS.
• "Autonomic nervous system" is a division of the PNS, regulating involuntary functions.
• "Brain and spinal cord" are the two main structures that make up the CNS, as per anatomical and physiological knowledge.

Answer:

C. Brain and spinal cord