FACIAL NERVE ANATOMY.. WITH DETAILED EXPLANATIONS AND ANIMATIONS.. MORE RELATED TO EAR.. FACIAL NERVE IS AN IMPORTANT TOPIC ASKED IN EXAMS...

8. • The geniculate ganglion, nervus intermedius, and greater superficial petrosal
nerve are visible by the fifth week.
• The second branchial arch gives rise to the muscles of facial expression in the
seventh and eighth week.
• To innervate these muscles, FACIAL NERVE courses across the region that
eventually becomes the middle ear.
• By the eleventh week, the facial nerve has arborized extensively.

9. TIME DURING GESTATION WHEN ANATOMIC STRUCTURES APPEAR
WEEK OF GESTATION STRUCTURES NOTED
3rd Collection of neural crest cells, anlage of VII cranial nerve nucleus (CNN)
5th Chorda tympani, greater petrosal, VII motor nucleus
6th External genu, postauricular branch, branch to posterior belly of digastric
7th Geniculate ganglion, nervus intermedius
8th Stapedius nerve, temporofacial and cervicofacial part of extracranial facial n
End of 8th Terminal branches of VII
7th to 8th Myoblasts that will form the facial muscles
12th All facial muscles

17. PRECENTRAL GYRUS OF THE FRONTAL
CEREBRAL CORTEX
CORTICOBULBAR TRACT
GENU OF INTERNAL CAPSULE
CEREBRAL PEDUNCLES
MOTOR NUCLEUS

41. GABRIEL FALLOPIUS

49. UGO FISCH – BOTTLE NECK CONCEPT

51. VULNERABLE TO ISCHAEMIA

54. Foramen
Lacerum

105. TYPE I TYPE II

121. CHILD ADULT
ABSENT MASTOID PROCESS & INCOMPLETE
TYMPANIC RING ; CHORDA TYMPANI MAY
EXIT THROUGH THE SM FORAMEN
MASTOID PROCESS PRESENT & TYPANIC
RING COMPLETE BY ADOLESCENCE
SECOND GENU IS MORE ACUTE & LATERAL SECOND GENU IS LESS ACUTE & MEDIAL
NERVE AFTER EXIT FROM SM FORAMEN IS
MORE ANTERIOR & LATERAL
NERVE TRUNK IS LESS ANTERIOR & DEEPER
NERVE IS VERY SUPERFICIAL OVER ANGLE
OF MANDIBLE
NERVE SUPERFICIAL OVER ANGLE OF
MANDIBLE.

123. SEGMENT LOCATION LENGTH mm
Supranuclear Cerebral cortex NA
Brainstem Motor nucleus of facial nerve,
superior salivatory nucleus of tractus solitarius NA
Meatal segment Brainstem to internal auditory canal (IAC) 13-15
Labyrinthine segment Fundus of IAC to facial hiatus 3-4
Tympanic segment Geniculate ganglion to pyramidal eminence 8-11
Mastoid segment Pyramidal process to stylomastoid foramen 10-14
Extratemporal segment Stylomastoid foramen to pes anserinus 15-20