symptoms are likely caused by paralysis of the seventh cranial
nerve, which is mainly a motor nerve supplying all the ipsilateral muscles of facial
expression.
The drooping of the right corner of the mouth represents paralysis of the
orbicularis oris muscle.Tearing of the right eye (epiphora) occurs because paralysis
of the orbicularis oculi muscle prevents closure of the eyelids and causes the lacrimal
duct opening to sag away from the conjunctiva.The inability to wrinkle the forehead is a result of paralysis of the frontalis muscle.Affected individuals will often
have the Bell phenomenon upon attempted closure of the eyelids, the eye on the
paralyzed side rolls upward.