Dryness of the mouth with facial nerve injury --- site of lesion at
(Chorda - tympani nerve) (97-Dhingra 4th)* Lesion in the cerebello pontine angle - is identified by the presence of vestibular and auditory defects and involvement of other cranial nerves such as Vth, IXth, Xth and Xlth* Lesion at the chorda typani nerve - presents with loss of taste from anterior two thirds of tongue* Decreased lacrimation indicates lesions proximal or at the geniculate ganglion; the secreto motor fibres leave the geniculate ganglion via greater superficial petrosal nerveChorda tympani arises from the facial nerve in the facial canal in the posterior wall of the middle ear, and leaves the middle ear through the petrotympanic fissureThe chorda tympani contains preganglionic parasympathetic secretomotor fibres to the submandibular and the sub lingual salivary gland, (Dryness of mouth)
Chorda- tympani nerve
Cerebello- pontine angle
Geniculate ganglion
Concusion of Tympanic membrane
Facial Nerve And Its Disorders