Bell's Palsy

Terminal Branches of Facial Nerve
Innervation
Temporal
Frontalis, orbicularis oculi, corrugator supercilli, & pyramidalis muscles
Zygomatic
Zygomaticus major, zytomaticus minor, elevator ala nasi, levator labii
superioris, caninus, depressor septi, compressor nasi, & dilator naris muscles
Buccal
Buccinator, & superior orbicularis oris muscles
Marginal mandibular
Risorius, quadratus labii inferioris, triangularis, mentalis, inferior orbicularis
oris muscles
Cervical
Platysma muscle
Figure 1: Corticonuclear and lower motor neuron pathways involved in facial expression.
Figure 1: Corticonuclear and lower motor neuron pathways involved in facial expression.