Cranial Nerves

The human body is a house of mysteries. There are so many things fitted in our body, many even invisible to the naked eye. Yet, every single thing in our body has a function. Many have more than one function. Be it a type of cell, tissue, organ, nerves, chemicals, etc., every part has a role to play. If there is even one dysfunction, we will not be able to work properly and lead a healthy and normal life.

It is not humanly possible for all of us to know every single detail about our bodies. However, some basic knowledge about the general structure and working of things is definitely called for, even when you are not majoring in Biology. You never know, when you might have to use the information that you have collected.

Let us take cranial nerves for example.

Through openings in the cranium which protects the brain, cranial nerves reach the brain and carries messages and information to it from the rest of the body and from it to the rest of the body. The cranial nerves are attached to the brain in a particular sequence. It is this sequence which has been used to name them, using Roman numerals. There are twelve pairs of cranial nerves in total in the human body.

Alpha Levo helps with cranial nerves which are involved with the senses of vision, taste, etc., can be looked upon as extensions of the brain. Also, these pairs of cranial nerves are different from the other sets of cranial nerves. These, are also sensory in nature, to an extent, but are unlike the aforementioned cranial nerves, they are also ‘motor’ in nature.

The twelve pairs of cranial nerves given with their Roman numerical identification are as follows:

I Olfactory- It is the cranial nerve responsible for our power of smell. The cranial nerve runs from underneath the frontal lobe of our brain to the top of the bridge of our nose.
II Optic- The cranial nerve is responsible for our power of vision. This cranial nerve runs from the base of the brain to the back of our eye’s retina. It actually covers the entire retina, through the nerve fibers.
III Oculomotor- It controls the small muscles which are responsible for moving the eyeball. Contraction of pupil would have been impossible without it.
IV Trochlear- Without this cranial nerve, the movement of eyeball downwards and upwards wouldn’t have been possible.
V Trigeminal- This is the largest cranial nerve of our body. It’s mainly sensory in nature.
VI Abducens- It is responsible for the movement of the eyeball outwards.
VII Facial- It is the motor to the muscles of the face. It also has a sensory attribute attached to it.
VIII Auditory (vestibulo-cochlear) – This cranial nerve through the inner ear, enters the brain. It is again sensory in nature and helps in hearing and maintaining body balance.
IX Glossopharyngeal- It is both motor and sensory for the neck, mouth, tongue larynx and pharynx. It also deals with transmitting sensory information regarding the blood pressure and blood gasses.
X Vagus- This cranial nerve is involved with many organs like the ones in the abdomen, lungs, heart and also with the glands of the alimentary tract.
XI Accessory- Is involved with spinal nerves of the uppermost area and the innervate muscles which deal with the movement of shoulders and head.
XII Hypoglossal- It is a motor to the muscles of the tongue.

 

Thus, it is safe to say that the reach of these twelve cranial nerves is enormous, and life without any one of them would be an extremely hard one to live.