Multiple Choice
In an introductory anatomy and physiology context, the peripheral nervous system (PNS) consists primarily of which structures?
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13. The Peripheral Nervous System
Introduction to the Peripheral Nervous System
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Which of the following structures are included in the peripheral nervous system (PNS)?
A
Cranial nerves, spinal nerves, and peripheral ganglia
B
Cerebellum, thalamus, and hypothalamus
C
Brain and spinal cord
D
Cerebral cortex and basal nuclei
Verified step by step guidance1
Step 1: Understand the distinction between the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS includes all neural structures outside the CNS.
Step 2: Identify the components listed in each option and classify them as either CNS or PNS structures. For example, the brain, spinal cord, cerebellum, thalamus, hypothalamus, cerebral cortex, and basal nuclei are all parts of the CNS.
Step 3: Recognize that cranial nerves and spinal nerves are bundles of nerve fibers that extend from the brain and spinal cord to the rest of the body, making them part of the PNS.
Step 4: Understand that peripheral ganglia are clusters of neuron cell bodies located outside the CNS, which also belong to the PNS.
Step 5: Conclude that the correct structures included in the PNS are cranial nerves, spinal nerves, and peripheral ganglia, as these are the neural components outside the brain and spinal cord.
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