Question

Which one of the branches of cranial nerves is not related to the vagus?

Answer 1

Vagus nerve supplies the visceral organs like lungs, heart, stomach, etc. Chorda tympani brings the taste sensations to the brain.

Complete answer:
Cranial nerves are the nerves that originate from the brain and the brain stem. They bring sensory information to the brain from receptors and take the motor information from the brain to the effector organ. Cranial nerves and their branches supply the head and neck regions. The cranial nerves exit the skull via various foramina (small holes like structures in the skull). After exiting the skull cranial nerves divide into various branches to supply their respective regions. There are 12 pairs of cranial nerves arising from the brain and brainstem. Out of 12 pairs of cranial nerves, some are sensory nerves, some are motor and some are mixed (both sensory and motor) nerves. They are:

1. Olfactory Nerve: It is a sensory Nerve. It is the nerve of smell. It transmits the smell sensations from the nasal cavity to the brain
2. Optic Nerve: It is a sensory Nerve. It is the nerve of vision. It transmits visual information from the retina of the eye to the brain
3. Oculomotor Nerve: It is a motor nerve. It supplies the eye muscles which perform eye movement.
4. Trochlear Nerve: It is a motor nerve. It supplies muscle of the eyeball
5. Trigeminal Nerve: It is a mixed nerve. It transmits sensory information from the face and transmits motor impulses to muscles around the mouth.
6. Abducens Nerve: It is a motor nerve. It transmits motor impulses to muscles of the eye
7. Facial Nerve: It is a mixed nerve. It Transmits taste sensation through chorda tympani branch of it and supplies muscles of facial expression
8. Vestibulocochlear Nerve: It is a sensory Nerve. It transmits impulses of hearing and balance from ears to the brain.
9. Glossopharyngeal Nerve: It is a mixed nerve. It innervates the back of the tongue and upper throat.
10. Vagus Nerve: It is a mixed nerve. It is the longest of all cranial nerves. It supplies various organs in the human body like the lungs, heart, stomach, etc. It also innervates the muscles of the voice box.
11. Accessory Nerve: It is a motor nerve. It supplies some muscles of the neck.
12. Hypoglossal Nerve: It is a motor nerve. It supplies various muscles of the tongue.
    So, the correct answer is Chorda tympani as it is the branch of the facial nerve and not related to the vagus nerve.

Note: To remember the name and sequence of the cranial nerves. Here is a trick.
Ooh, Ooh, Ooh, to touch and feel very good velvet, a heaven. (OOOTTAFVGVAH) – for the sequence of cranial nerves.