L7: Facial Nerve Flashcards
Peripheral Nerves unique to Cranial Nerves?
- Special visceral afferent (SVA): ____________
- Special somatic afferent (SSA): ____________
- Special visceral efferent (SVE): ____________
- Special visceral afferent (SVA): taste, smell
- Special somatic afferent (SSA): vision, balance, hearing
- Special visceral efferent (SVE)- (branchial efferent) to muscles derived from branchial arches
Which cranial nerves is the nucleus solitarius involved with?
CN VII, IX, X
Functions of the Facial Nerve?
- SVEs?
- GVEs?
- SVAs?
- GSAs?
Facial Nerve
Facial Nerve
Facial Nerve
Facial Nerve
Facial Nerve Intracranial Course
- Facial nerve exits brainstem lateral to CNVI at _______________
- It then courses through _____________ (with CNVIII) towards _______________ (___________ of temporal bone)
- Beyond the IAM, CNVII forms a bend where ______________ is located
- Nerve courses posteriorly in facial canal towards _____________________
- Facial nerve exits brainstem lateral to CNVI at pontomedullary junction
- It then courses through subarachnoid space (with CNVIII) towards internal acoustic meatus (petrous part of temporal bone)
- Beyond the IAM, CNVII forms a bend (genu) where geniculate ganglion is located
- Nerve courses posteriorly in facial canal towards stylomastoid foramen
Main ganglion for all sensory and special sensory CN7 functions?
Geniculate Ganglion
Innervates lacrimal and nasal/palatine glands, via sphenopalatine ganglion?
Greater Petrosal Nerve
Transmits taste sensation + secretomotor supply to salivary glands (sublingual/submandibular)
Chorda Tympani
(CNIX Innervates Parotid Gland)
Intracranial Components of Facial Nerve? (4)
Brachiomotor supply of the Facial nerve? (5)
Where does this supply arise?
- Muscles of facial expression (2nd branchial arch)
- Stapedius
- Occipitalis (via post. auricular branch)
- Posterior belly of digastric
- Stylohyoid
Most supply arises after facial nerve exits Stylomastoid Foramen
Difference in facial Nerve (CNVII) supply to the upper and lower face?
Upper (bilateral)
Lower (contralateral only)
Facial Nerve Parasympathetic (GVE) Innervations?
Nerves that innervate each gland?
Pre-ganglionic neurons arise in the ____________________________
- Lacrimal, Nasal + Palatine glands via greater Petrosal Nerve
- Sublingual & Submandibular (salivary) glands via Chorda Tympani
Pre-ganglionic neurons arise in the Superior Salivatory Nucleus
SVA of Facial Nerve? Where do its cell bodies arise and travel?
TASTE
- Cell bodies in Geniculate Ganglion
- Afferents carried via lingual nerve & chorda tympani towards Nucleus Solitarius
Testing for CNVII?
Ask pt to make facial expressions: see if there are any kind of abnormalities
What does a lower motor lesion of branches of the facial nerve lead to?
Bell’s Palsy
*Upper Motor Lesions spare upper part of face as supplied