In some people, there's also dryness of the affected eye or mouth because the facial nerve innervates the lacrimal, submandibular, and sublingual glands.
The facial nerve also innervates the sublingual and submandibular glands, which secrete saliva, as well as the lacrimal gland which produces tears, and mucous membranes of the nose, mouth, and nasopharynx.
Right here on each side of the top of your eye, you have a little tiny organ inside your body called the lacrimal gland, or a simpler name for that is the tear gland.
And while all three are secreted from the lacrimal glands in your eye, only the production of emotional tears is controlled by the hypothalamus - an area of your brain that regulates emotional responses.