Note that the upper motor neurons for the. Check taste with sugar, salt, or lemon juice on cotton swabs applied to the lateral aspect of each side of the tongue. Ask patient to smile, puff out their cheeks, clench their eyes tight, wrinkle their brow, and so on. Also look for asymmetries in spontaneous facial expressions and blinking. Such as a facial nerve injury, typically cause weakness involving the whole ipsilateral face. Old photographs of the patient can often aid your recognition of subtle changes.
What is being tested?
Facial nerve ipsilateral. Look for asymmetry in facial shape or in depth of furrows such as the nasolabial fold. Like olfaction, taste is often tested only when specific pathology is suspected, such as in lesions of the facial nerve, or in lesions of the gustatory nucleus (nucleus solitarius).