Often asked: What Is The Anatomy Of Cranial Nerve Vii?

What is cranial nerve VII?

The facial nerve is the seventh cranial nerve (CN VII ). The facial nerve provides motor innervation of facial muscles that are responsible for facial expression, parasympathetic innervation of the glands of the oral cavity and the lacrimal gland, and sensory innervation of the anterior two-thirds of the tongue.

What does the 7th cranial nerve control?

The facial nerve (the labyrinthine segment) is the seventh cranial nerve, or simply CN VII. It emerges from the pons of the brainstem, controls the muscles of facial expression, and functions in the conveyance of taste sensations from the anterior two-thirds of the tongue.

What muscles are innervated by cranial nerve 7?

These innervate the muscles of facial expression:

  • Temporal branch – Innervates the frontalis, orbicularis oculi and corrugator supercilii.
  • Zygomatic branch – Innervates the orbicularis oculi.
  • Buccal branch – Innervates the orbicularis oris, buccinator and zygomaticus muscles.
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Where is the 7th facial cranial nerve?

Where is the 7th Cranial Nerve located? The two 7th Cranial Nerves (CN VII) are located on either side of the brainstem, at the top of the medulla. They are mixed cranial nerves with BOTH sensory and motor function. CN VII controls the face and is mainly FACE MOVEMENT with some face sensation.

What are the 12 cranial nerves and functions?

The 12 Cranial Nerves

  • I. Olfactory nerve.
  • II. Optic nerve.
  • III. Oculomotor nerve.
  • IV. Trochlear nerve.
  • V. Trigeminal nerve.
  • VI. Abducens nerve.
  • VII. Facial nerve.
  • VIII. Vestibulocochlear nerve.

How do you heal the 7th cranial nerve?

Corticosteroids. Corticosteroid medications reduce swelling in the seventh cranial nerve. Medication is taken by mouth once a day for 10 to 14 days to ensure the nerve recovers. If your symptoms indicate that the herpes zoster virus is causing inflammation, your doctor may recommend a stronger dose of corticosteroids.

What is the difference between Bell’s palsy and stroke?

Bell’s palsy and strokes are two medical conditions that start in the brain. To the average person, the signs of Bell’s palsy look a lot like a stroke ‘s symptoms, but they are vastly different. Bell’s palsy is caused by damage to a single nerve, whereas a stroke is caused by a lack of oxygen and blood to the brain.

What causes damage to the 7th cranial nerve?

Other causes of sudden one-sided facial nerve paralysis include a traumatic head injury, which may damage the seventh cranial nerve; a stroke, which occurs as a result of a loss of blood supply to the brain stem; a viral infection, such as herpes simplex or herpes zoster; or, more rarely, Lyme disease.

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Which cranial nerve is responsible for your tears?

Cranial Nerve: Major Functions:
V Trigeminal chewing face & mouth touch & pain
VI Abducens turns eye laterally
VII Facial controls most facial expressions secretion of tears & saliva taste
VII Vestibulocochlear (auditory) hearing equillibrium sensation

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Is cranial nerve 7 motor or sensory?

Table of cranial nerves

No. Name Sensory, motor, or both
VI Abducens Mainly motor
VII Facial Both sensory and motor
VIII Vestibulocochlear In older texts: auditory, acoustic. Mostly sensory
IX Glossopharyngeal Both sensory and motor

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What is the main function of CN VIII?

The vestibulocochlear nerve (auditory vestibular nerve), known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain.

What are the symptoms of cranial nerve damage?

What are the symptoms of cranial neuropathies?

  • Pain.
  • A tingling sensation.
  • Numbness.
  • Skin that feels sensitive to the touch.
  • Weak or paralyzed muscles. This can cause drooling or slurred speech.
  • Vision changes.

How do you treat facial nerve damage?

There are three basic approaches to facial nerve repair: direct nerve repair, cable nerve grafting or nerve substitution. Direct nerve repair is the preferred option whenever possible and is performed by removing the diseased or affected portion of the nerve, then reconnecting the two nerve ends.

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