ASDS Facial Anatomy

Branches of facial nerve

"To Zanzibar By Motor Car" Temporal Zygomatic Buccal Masseteric Cervical

Mandibular Division (V3)

*Auriculotemporal Branch* - External ear, auditory canal, temple, temporoparietal scalp, TMJ, tympanic membrance *Buccal Branch* -Cheek, buccal mucosa, gingiva *Inferior alveolar Branch* - Mandibular teeth (mental nerve = terminal branch)

Maxillary Division (V2)

*Infraorbital* - Medial cheek, upper lip, nasal sidewall, ala, lower eyelid *Zygomaticofacial* - Malar eminence *Zygomaticotemporal Branch* - Temple and Supratemporal Scalp

Ophthalmic V1

*Nasociliary Branch* 1. *Infratrochlear* - nasal root, medial canthus 2. *Anterior ethmoidal* - nasal tip, dorsum, supratip, columella) *Frontal Branch* - Supratrochlear (medial forehead) -Supraorbital (frontal scalp, medial upper eyelid)

Buccal Branch (CNVII)

-Buccinator -Depressor septi nasii -Nasalis (transverse) -Orbicularis *oris* -Levator labii superioris -Levator anguli oris -Zygomaticus major/minor -Risorius

Zygomatic Branch (CNVII)

-Lower orbicularis oculi -Procerus -Nasalis (ala) -Levator anguli oris -Zygomaticus major

Marginal Mandibular Branch (CNVII)

-Orbicularis oris -*Depressor anguli oris* -*Depressor labii inferioris* -Mentalis -*Platysma*

What happens if marginal mandibular branch is injured?

Asymmetric smile (*normal at rest, crooked when smiling*) Can't evert lower lip *Drooling*

What happens if temporal branch is injured

Brow ptosis *Inability to elevate forehead*

Zygomatic branch injury?

Can't close eyes tightly Inability to flare nostrils Trouble elevating lip Lower eyelid droop (ectropion)

What happens if cervical branch is injured?

Inability to grimace

Temporal Branch (CN VII)

Innervates: -Frontalis -Orbicularis oculi -*Corrugator supercilii* -*Procerus*

Cervical Branch (CNVII)

Platysma

Buccal branch injury?

Accumulate food between teeth/cheek *Uneven smile*, can look like *facial droop* at rest Decreased pucker, lip purse, lip seal *Muffled speech* Can't wrinkle nose