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Question

Which of the following statement(s) is/are true?
1. Somatic neural system transmit impulses from CNS to skeletal muscles.
2. Autonomic neural system transmits impulses from CNS to involuntary organs and smooth muscles.
3. Unmyelinated nerve fibres are found in spinal and cranial nerves
4. Myelinated nerve fibres are found in autonomous and the somatic neural systems.

A
1 and 2 only
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B
1 and 3 only
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C
3 and 4 only
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D
1, 2 and 4 only
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Solution

The correct option is A 1 and 2 only
Somatic neural system and autonomic neural system are two divisions of the peripheral nervous system. Somatic neural system is responsible for the voluntary control of the body. It transmits impulses from the CNS to the skeletal muscles and controls voluntary movements and actions.
Autonomic neural system is responsible for involuntary actions of the body. It transmits impulses from CNS to involuntary organs and smooth muscles. It regulates actions like heart rate, digestion, respiratory rate, pupillary response, urination etc.
Myelinated nerve fibres are those enclosed by Schwann cells which form myelin sheath around the axon and they are found in spinal and cranial nerves. Unmyelinated nerve fibres are those enclosed by Schwann cells however these Schwann cells do not synthesize myelin sheath around the axon. Unmyelinated nerve fibers are commonly found in autonomous and the somatic neural systems.
Hence statement 1 and 2 only are correct.

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