Educational objective: The upper face receives input from bila | Uworld | Step 2ck

Educational objective: The upper face receives input from bilateral motor cortices. Lesions in the central nervous system typically cause unilateral lower facial weakness that spares the forehead whereas peripheral lesions (eg, Bell palsy) cause weakness that affects the entire side of the face. Bell palsy may also result in decreased eye lacrimation, hyperacusis, and reduced taste sensation over the anterior tongue.