T The seventh cranial nerve or known as the facial nerve which contain thetrue facial nerve with the lower neuron motor and sensory root theintermedius leaves the brainstem from the lower part of the pons in thepontocerebellar angle.The facial nerve is the motor nerve of all theexpression muscles of the face and the platysm and buccinator; themuscles of the external ear; the posterior belly digastricus; the stylohyoidand the stapedius. The greater superficial nerve responsible forlacrimation, branch to the stapedius involved in decreasing the amplitudeof loud sounds from the tympanic membrane, and its chorda tympanibranch supplies taste to the anterior two-thirds of the tounge. The facialnerve is often paralyzed than any other of the cranial nerves. Twitching,weakness, or paralyses of the face are symptoms of a disorder involvingthe facial nerve. The effect of facial nerve damage is varying depend onthe site of the lesion along the course of the nerve.