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We wouldn’t be able to talk, taste, chew, or swallow without the cranial nerves of our face and mouth.

Find out how these nerves help us move our tongue and enjoy everything from kissing to food to conversation.

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The Sensation and Movement of the Face

When chewing on a juicy steak, there’s a lot more to what goes on than meets the eye. Besides the obvious preparation of the food, there are four major nerves involved in helping you taste, chew, and swallow the delicious meat. In addition, the way you relay your satisfaction with the food to others through facial expressions and words has to do with these four nerves as well.

Facial Nerve or Cranial Nerve VII

Location of the facial nerve
Facial Nerve Diagram

Assuming you’re not a vegetarian, the smell of a nice steak is going to bring a smile to your face. You use your smile to nonverbally communicate your pleasure. The most important nerve controlling muscles of facial expression, including those involved in a smile, is unsurprisingly called the facial nerve, also known as cranial nerve VII.In addition to helping you show your satisfaction at the thought of eating a nicely cooked dinner, the facial nerve has other critical functions involved in eating that delicious meal.

As you put a piece of the steak into your mouth, you’re going to experience a pleasant taste. This is mainly thanks in part to the fact that the facial nerve also conveys the sensation of taste from the anterior two-thirds of your tongue.And, even before you put the steak in your mouth, there is saliva inside of your mouth that will help in the process of digestion. Two out of the three of the most important salivary glands are innervated by the facial nerve. These glands are known as the submandibular and sublingual salivary glands. Combined, these two glands produce the vast majority of the saliva in your mouth.

Finally, you may enjoy and love your meal so much that you’ll begin to cry tears of joy. This is thanks to the fact that the facial nerve also innervates the lacrimal gland, the gland that produces tears.

Trigeminal Nerve or Cranial Nerve V

The trigeminal nerve is vital for facial sensation.
Trigeminal Nerve Diagram

As you cry tears of joy at the awesome taste in your mouth, all thanks to the facial nerve, you’ll want to wipe those tears away from your eyes and cheek. As you wipe away the tears, you can sense the cloth against your skin. This is all thanks to the fact that the most important nerve involved in facial sensation is called the trigeminal nerve, also known as cranial nerve V.

Hence, while CN VII provides motor movement for the muscles of facial expression, CN V is the most important nerve in facial sensation. In addition, CN V is the nerve that innervates the muscles that help move your jaw up and down in order to chew that savory steak. Hence, CN V innervates the muscles of mastication.

Hypoglossal Nerve or Cranial Nerve XII

In between chewing your food and enjoying its sensation, you’ll probably want to express to whomever cooked the meal how much you enjoyed it. It did make you cry, after all; that’s how good it was. One of the most important structures involved in speech is your tongue. Try holding your tongue with your clean fingers and tell me how well you can speak out loud.

You’re not going to do too well.In order to get the muscles of your tongue to move about and help you express your sincere appreciation of the food, you’re going to have to have a nerve responsible for the innervation of those muscles. Hence, the nerve that innervates the muscles of the tongue is called the hypoglossal nerve or cranial nerve XII.

The hypoglossal nerve is necessary for speech.
Cranial nerve IX is important for swallowing.
pharynx, which helps you swallow.Your poor fat cat has a lot health issues due to his weight. Therefore, you need to give your fat cat, who has nine lives like all cats, some pills to keep him healthy and help him keep all of his nine lives. In order to give him his medicine, you need to put the pill at the back of his tongue, where he will hate the taste of the pill, so that he can swallow it. Hence the ninth cranial nerve is involved in taste sensation at the back of the tongue, ‘glosso,’ and in swallowing, thanks to the pharynx.

Since your poor cat had a bitter pill to swallow, you decide to buy him a dozen – that’s right, twelve – doughnuts to spoil him. Now I know exactly why he’s so fat. Since the twelve doughnuts are a little bit too big for the cat to swallow, he decides to lick the frosting off of the top of the twelve doughnuts with his tongue. The twelfth cranial nerve innervates the tongue used to lick the twelve doughnuts.

It’s called the hypoglossal nerve – again, ‘glossal’ referring to the tongue.P.S.

As a veterinarian, I do not recommend you give your cat doughnuts for a wide variety of reasons.

Lesson Summary

Let’s review what the cranial nerves do one more time.The facial nerve, also known as cranial nerve VII, is the most important nerve controlling muscles of facial expression. It is responsible for the sensation of taste in the anterior two-thirds of your mouth.

It also innervates two salivary glands and the lacrimal gland.The trigeminal nerve, also known as cranial nerve V, is the most important nerve involved in facial sensation and innervates the muscles of mastication.Your tongue also helps you chew, or masticate, your food. It is innervated by the nerve that innervates the muscles of the tongue, called the hypoglossal nerve or cranial nerve XII. Don’t forget that this nerve also helps you speak, as it’s kind of hard to do so without your tongue.Finally, the glossopharyngeal nerve, also known as cranial nerve IX, is a nerve that is responsible for the sensation of taste in the posterior one-third of the tongue and, like the hypoglossal nerve, innervates muscles involved in swallowing that juicy piece of steak.

Learning Outcome

You will be able to describe the functions of the facial nerve, trigeminal nerve, hypoglossal nerve and glossopharyngeal nerve after watching this video lesson.

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