Question

How many pairs of cranial nerves present in a human body?
A. 12
B. 15
C. 11
D. 14

Answer 1

Hint: Cranial nerves are a pair of nerves that connect the brain to different parts of body, neck and head. The cranial nerves extend from the central nervous system above the level of the first vertebra of the spine. Each cranial nerve is paired and is on both sides.

Complete answer:
PNS is an extensive network of spinal and cranial nerves that connect to the brain and spinal cord. It contains sensory receptors that help process changes in the internal and external environment. This information is sent to the CNS via afferent sensory nerves.
The Peripheral Nervous System is then divided into the autonomic nervous system and the somatic nervous system. autonomic nervous system has unconscious control over internal organs, blood vessels, smooth muscle, and heart muscle. The somatic nervous system has voluntary control over the skin, bones, joints and skeletal muscles. The two systems work together, via the nerves from the CNS that enter and become part of the CNS and vice versa.
Peripheral Nervous System (PNS) Contains nerves that leave the brain and spinal cord. Cranial nerves originate from the brain, there are twelve (12) pairs of cranial nerves.
The 12 pairs of cranial nerves are
> Olfactory nerve
> Optic nerve
> Oculomotor nerve:
> Trochlear nerve
> Trigeminal nerve
> Abducens nerve:
> Facial nerve
> Vestibulocochlear nerve
> Glossopharyngeal nerve
> Vagus nerve
> Accessory nerve
> Hypoglossal nerve

So the correct option is (A).

Note:
Cranial nerves that contain only sensory nerve fibres are called sensory nerves.
Cranial nerves that contain only motor nerve fibres are called motor nerves
Cranial nerves that contain both motor nerve fibres and sensory nerve fibres are called mixed nerves
The largest cranial nerve is the trigeminal nerve and it has both sensory and motor functions.
Thirty-one (31) pairs of spinal nerves emerge from the spinal cord. There are 8 pairs in the neck area, 12 pairs in the chest area, 5 pairs in the waist area, 5 pairs in the sacral area and 1 pair in the tail area