Question

Which is a sensory nerve?
A. Trigeminal
B. Vagus
C. Optic nerve
D. None of the above

Answer 1

Hint: Nervous system is the most complex system that is located in our body, where it is the one which is needed for the actions of the stimuli that takes place and it comprises of two types, that are central nervous system and peripheral nervous system, and CNS is made up of the brain and spinal cord while the peripheral nervous system is made up of all nerves that connect this CNS to all body parts.

Complete answer:
-Nerves are defined as the long and they are arranged as fibres which are covered with bundles, and their role is to connect the central nervous to all body parts, and the nerve which carries the outer response or stimuli to the brain are termed as sensory nerves, and the nerve which takes the response from the brain to the target tissue or muscle then it is a motor nerve, where some nerves in our body show both sensory and motor action, and those nerves are usually termed as mixed nerves.
-Each spinal nerve arises from the intervertebral foramen, and they possess two roots, that are nerve fibre that occurs from the dorsal root are afferent sensory nerves which carries always the information from the body parts or from the external stimulus are efferent motor roots which takes the motor information from the brain, so all of the spinal nerves are mixed nerves.
Now let us find solution from given options:
Trigeminal: It is largest of all the cranial nerves and it is most complex. It is a motor nerve.
Vagus: It is the 10th cranial nerve and carries information from body parts so they are motor nerves.
Optic nerve: it is a nerve that is present in the eye. It carries information from the retina to the brain so it is a sensory nerve.
Hence, the correct answer is option D.

Note: Spinal nerves are constituent of the peripheral nervous system and they derived the name as they are raised from the spinal cord, and this is present as pairs and each nerve as two roots.