Question:

Which of the following is purely motor cranial nerve?

Updated On: Jul 2, 2022
  • olfactory
  • optic
  • abducens
  • vagus
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The Correct Option is C

Solution and Explanation

Purely motor cranial nerves are those efferent nerves which contain only motor nerve fibres and connect effectors (muscles & glands) to the CNS. Eg. oculomotor, trochlear, abducens, accessory spinal & hypoglossal cranial nerves. Olfactory & optic are purely sensory cranial nerves (these nerves have only sensory nerves fibres which connect only receptor organs to CNS). Vagus is a mixed cranial nerve having both sensory & motor nerve fibres.
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Notes on human nervous system

Concepts Used:

Human Nervous System

The human nervous system is responsible for controlling and coordinating all the activities of the human body.

The three major functions of the human nervous system are:

  1. Gathering or assembling sensory information from the body and external environment.
  2. Processing and interpreting the sensory information acquired.
  3. Conveying or transferring appropriate response to the sensory information acquired.

The nervous system is mainly divided into two, namely:

The Central Nervous System (CNS) comprises the brain and spinal cord.

  1. The brain is majorly involved in the perception and processing of sensory input. It also regulates or manages voluntary motor responses and homeostatic mechanisms.
  2. The spinal cord act as a pathway for the transmission of information between the brain and the peripheral nervous system. It also takes action on reflex actions.

The Peripheral Nervous System (PNS) comprises sensory/motor neurons and ganglion.