# Cranial Nerves: All you need to know .

The nerves present in our Peripheral Nervous system are the cranial nerves. There are 12 pair of these nerves present, meaning that they are present on the both sides. Following are the nerves:

(o) Olfactory nerves (o) Optic nerves (o) Oculomotor nerves (p) Pathetic Nerves (t) Trigeminal Nerves (a) Abducens Nerves (f) Facial Nerves (a) Auditory/ Vestibulocochlear Nerves (g) Glossopharyngeal Nerves (v) Vagus Nerves (a) Accessory spinal Nerves (h) Hypoglossal Nerves

They are set as per order. From the above Oculomotor, Pathetic and abducens nerves are the ones that control the eye movement. And Facial and Glossopharyngeal Nerves control the Taste and Salivation(saliva formation). Also to remember the nerves try remembering the word oooptafagvah or uptafagua(for pronouncing).

Olfactory nerve: This is the first and shortest cranial nerve and the one used in the sense of smell. It is able to do regeneration. Olfactory receptor neurons continue to be born throughout life. The sense of smell arises from the stimulation of olfactory receptors by small molecules of different spatial, chemical, and electrical properties that pass over the nasal epithelium in the nasal cavity during inhalation. These interactions are made into electrical activity in the olfactory bulb, which then transmits the electrical activity to other parts of the olfactory system and the rest of the central nervous system via the olfactory tract.

Optic nerves: These are the second cranial nerve. These transmit viaual information from retina to brain. The optic nerve does not regenerate after the are cut.

Oculomotor nerves: It is the third cranial nerve. This nerve is responsible for eyeball and eyelid movement. It controls the muscles that allow for visual tracking and fixation by the eye.

Pathetic Nerves: This the fourth cranial nerve. It is the only cranial nerve that emerges dorsally from the brain, which also makes it the longest pathway. It processes brain signals to move eyes up and down and outwards. Double vision, otherwise known as diplopia, results from problems with muscle or the nerve. Complications from these issues will result in a diminished ability to walk, especially down stairs.

Trigeminal Nerves: It is the fifth one and responsible for sensation in the face , and other functions such as biting and chewing. And also it is the largest because it is a twin nerve and also there are three meaning it is thrice twinned. The motor function activates the chewing function or the mastication

Abducens Nerves: It is the sixth nerve, controls the movement of a single muscle, it controls the muscle( lateral rectus muscle) of the eye that controls the movement of eye.

Facial Nerves: It is the seventh cranial nerve, it controls the muscles of facial expression. Other functions include the taste sensations from the anterior two-thirds of the tongue and oral cavity.

Auditory/ Vestibulocochlear Nerves: The eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain. A human's sense of equilibrium is determined by this nerve. Problems with the vestibulocochlear nerve can result in vertigo, vomiting, ringing in the ears, a false sense of motion, motion sickness, or even hearing loss.

Glossopharyngeal Nerves: The ninth cranial nerve . The glossopharyngeal nerve has many functions, including receiving various forms of sensory fibers from parts of the tongue, carotid body, the tonsils, the pharynx, and the middle ear.

Vagus Nerves: The tenth and the longest cranial nerve, the vagus forms part of the involuntary nervous system and commands unconscious body procedures, such as keeping the heart rate constant and controlling food digestion. Recent research has revealed that stimulation of the vagus decreases the frequency and severity of epileptic seizures in animals.

Accessory spinal Nerves: The eleventh cranial nerve, provide motor control of the sternocleidomastoid and trapezius muscles. . Dysfunction of the spinal accessory nerve can negatively affect the shoulder girdle's performance.

Hypoglossal Nerves: The twelfth cranial nerve, The nerve is involved in controlling tongue movements required for speech, food manipulation (i.e. formation of bolus), and swallowing.

This topic might not be that interesting and also i have not included terminal nerve as i didn't know much about it. And if you have anything to add or any comment please write it below. Thank you. And if you have any topic in mind please give me suggestions, i am thinking of vitamins or bones.

Note by Hardipinder Singh
6 years, 4 months ago

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i'd loved learning about brain and thanks for this amazibg topic.😜

- 6 years, 4 months ago

- 6 years, 4 months ago

sir i have a question that, if the spinal cord of the man is stronger then the man is also stronger. what is the reason behind this ?

- 6 years, 4 months ago

First plz no need to call me sir and second spinal cord is a bundle of nervous tissue and support cells that extend from the brain. So basically it is just a connection. It can't be stronger or weaker , each and every human has a the same anatomy in them. Also the stronger thing might be the muscle you are talking about. If that then itis because of certain back exercises that pump the muscle , making them stronger.

- 6 years, 4 months ago

I m calling u sir bcoz I m a 12th std student of 15 years of age

- 6 years, 4 months ago

Ok but still no need to call me sir... I might be older but not a sir :-)

- 6 years, 4 months ago

Where did u gt these notes

- 6 years, 4 months ago

Ok Thank u sir

- 6 years, 4 months ago

No problem at all.:-)

- 6 years, 4 months ago

I was a medical student or you can say I studied pre med. Now i am a bca student.

- 6 years, 4 months ago

Bro I wnt to be a doctor So which books should I prefer

- 6 years, 4 months ago

First have a thorough grasp on the ncert, then go for any other book. Each and every line of ncert should be by heart to you then only go for any other book. For the enterance exam buy any mcq 10 yr book... That will help you a lot in the high runner exams.

- 6 years, 4 months ago

Ok fine

- 6 years, 4 months ago