Concept explainers
Which of the following structures is not part of the central nervous system? (a) the brain, (b) a nerve, (c) the spinal cord, (d) a tract.
To determine:
The structure that is not a part of the central nervous system is:
The brain
A nerve
The spinal cord
A tract
Answer to Problem 1MC
Correct answer:
(b) A nerve is not considered as a part of central nervous system.
Explanation of Solution
Explanation for the correct answer:
The nerve consists of one or more bundles of nerve fibers. It transmits the impulses of sensation to the brain. It allows communication between the brain and the body parts. It is not a part of the central nervous system (CNS). It is included in the peripheral nervous system (PNS). Thus option (b) is considered as a correct answer.
Explanation for the incorrect answer:
Option (a) is given as brain is not a part of central nervous system (CNS). This statement is false as central nervous system mainly consists of two parts: the brain and spinal cord. CNS is the main processing center of the body and brain makes the largest part of the CNS. Thus this option is considered as an incorrect answer.
Option (c) is given as spinal cord is not a part of central nervous system (CNS). This statement is false as central nervous system mainly consists of two parts: the brain and spinal cord. Spinal cord mainly performs the function of transmission of nerve signals in the body. Thus this option is considered as an incorrect answer.
Option (d) is given as tract is not a part of central nervous system (CNS). This statement is false as the nerve fibers of central nervous system are organized in bundles called as tracts or fasciculi and assumed as a vital part of CNS. Thus this option is considered as an incorrect answer.
Thus it is concluded that brain, spinal cord and tract are the important part of central nervous system whereas nerves are considered as a part of peripheral nervous system.
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