Neurology: Facial Nerve Functions and Pathway

Which part of the tongue carries taste sensation innervated by the facial nerve?

Anterior 2/3

Where is the nucleus of the facial nerve located?

Pons

After emerging from the internal auditory meatus, the facial nerve divides within which gland?

Parotid gland

Which muscle receives a branch from the facial nerve within the facial canal?

Stapedius Signup and view all the answers

What causes paralysis of the lower half of the face in upper motor neurone facial lesion (supranuclear)?

Unilateral supply to lower half of the face Signup and view all the answers

Which cranial nerve does the facial nerve emerge medial to at the lower border of pons?

Cranial nerve VIII (Vestibulocochlear) Signup and view all the answers

Which muscles are innervated by the facial nerve?

Muscles of expression Signup and view all the answers

Which glands receive secretory fibers from the facial nerve?

Submaxillary and submandibular glands Signup and view all the answers

What is the most likely reason that the patient, despite the inability to move paralyzed muscles voluntarily, can still move the affected side on emotional excitement?

The emotional control comes from the frontal lobe, which is still intact outside the damaged pyramid fibres. Signup and view all the answers

Based on the given information, what is a defining characteristic of Bell's Palsy?

It affects both upper and lower facial muscles on one side, with loss of both voluntary and emotional movements. Signup and view all the answers

Why is exposure to cold or air drafts listed as a precipitating factor for Bell's Palsy?

Cold exposure triggers an autoimmune reaction that affects the facial nerve, leading to inflammation and palsy. Signup and view all the answers

What pathology is associated with Bell's Palsy?

Interstitial neuritis Signup and view all the answers

What clinical manifestation is typical of Bell's Palsy?

Deviation of the angle of mouth to the affected side Signup and view all the answers

What is a potential complication associated with Bell's Palsy?

Unilateral lacrimation on eating due to regenerating facial nerve fibers to the lacrimal gland Signup and view all the answers

What treatment approach is recommended for approximately 60% of Bell's Palsy cases?

Corticosteroids such as prednisone Signup and view all the answers

Why is treatment with acyclovir or valacyclovir indicated in some cases of Bell's Palsy?

They are only indicated when there is evidence of herpetic vesicles in the external ear canal Signup and view all the answers