2. • IT IS 7TH CRANIAL NERVE
• KNOWN AS QUEEN OF FACE
• NERVE OF 2ND BRANCHIAL ARCH
3. FUNCTIONAL COMPONENTS
1. SPECIAL VISCERAL EFFERENT:MUSCLES OF
FACIAL EXPRESSION,ELEVATION OF HYOID
BONE
2. GENERAL VISCERAL
EFFERENT:SECRETOMOTOR TO
SUBMANDIBULAR ,SUBLINGUAL
GLAND,LACRIMAL GLAND,GLAND OF
NOSE,PALATE,PHARYNX
3. GENERAL VISCERAL AFFERENT
4. • SPECIAL VISCERAL AFFERENT:CARRY TASTE
SENSATION TO ANT2/3RD OF TONGUE EXCEPT
VALATE PAPILLA
• GENERAL SOMATIC AFFERENT:SKIN OF EAR
5. NUCLEI
• 4 NUCLEI IN LOWER PONS
1. MOTOR OR BRANCHIOMOTOR
2. SUPERIOR SALIVATORY
3. LACRIMAL
4. NUCLEUS TRACTUS SOLITARIUS
MOTOR ROOT LIES IN DEEP IN RETICULAR
FORMATION OF PONS
6. COURSE
• ATTACH TO BRAIN STEM AT OR CLOSE TO JUNCTION
OF PONS WITH MEDULLA
• ATTACHED TO BRAIN STEM BY 2 ROOTS
• MOTOR
• SENSORY
• SENSORY –NERVOUS INTERMEDIUS
• 2 ROOTS OF FN ARE ATTACHED TO LOWER BORDER
OF PONS JUST MEDIAL TO 8TH NERVE
7. • 2 ROOTS RUN LATERALLY AND FORWARD
WITH 8TH CN TO REACH INTERNAL ACOUSTIC
MEATUS
• IN MEATUS MOTOR ROOT LIES IN A GROOVE
WITH 8TH ERVE WITH SENSORY ROOT
INTERVEANING
• 7TH &8TH NERVE ARE ACCOMPANIED BY
LABRYNTHINE VESSEL
• AT BOTH OR FUNDUS OF MEATUS 2 ROOTS IE
SENSORY & MOTOR FUSES TOGETHER &
FORM SINGLE TRUNK WHICH LIES IN PART OF
PETROUS PART OF TEMPORAL BONE
8. • MOTOR ROOT SUPPLIES MUSCLE OF FACE
• NERVOUS INTERMEDIUS –TASTE PERCEPTION
• ENTERS ITS OWN CANAL IE FACAIL CANAL
• RUNS ACROSS MEDIAL WALL AND DOWN
POSTERIOR WALL OF TYMPANIC CAVITY TO
STYLOMASTOID FORAMEN
• WITHIN CANAL IT DIVIDES IN TO 3 PART WITH 2
BENDS
• 1ST PART IS DIRECTED LATERALLY ABOVE
VESTIBULE
• 1ST BEND-AT JUNCTION OF 1ST & 2ND PART WHICH
IS SHARP
• LIES OVER ANTERIOR SUPERIOR PART
PROMONTRY
9. • IT IS CALLED AS GENU
• HERE GENICULATE GANGLION LIES
• BRANCHES WHICH ARISES FROM FN WITHIN
TEMPORAL BONE CAN BE DIVIDED IN TO
THOSE WHICH COMES FROM GENICULATE
GANGLION
• 2ND PART RUNS BACKWARD IN RELATION TO
MEDIAL WALL OR MIDDLE EAR OF
PROMONTORY
• 2ND BEND IS GRADUAL AND LIES IN B/W
PROMONTORY & ADITUS TO MASTOID
ANTRUM
10. • 3RD PART DIRECTED VERTICALLY DOWNWARD
BEHIND PROMONTORY
• MAIN BRANCH FROM GANGLION IS “GREATER
PETROSAL NERVE”
• A BRANCH OF NERVOUS INTERMEDIOUS
• PASS ANTERIORLY
• RECIEVES BRANCH FROM TYMPANIC PLEXUS
AND TRAVERSOUS A HIATUS ON ANTERION
SURFACE OF PETROUS PART OF TEMPORAL
BONE
• ENTER MIDDLE CRANIAL FOSSA
11. • RUNS FORWARD IN GROOVE ON BONE ABOVE
LESSER PETROSAL NERVE
• PASSES BENEATH TRIGEMINAL GANGLION TO
REACH FORAMEN LACERUM
• VIDINOUS NERVE
• EXTRACRANIAL COURSE
• FN EMERGES FROM BASE OF SKULLAT
STYLOMASTOID FORAMEN
• LIES 9MM AWAY FROM POST BELLY OF
DIGASTRIC & 11MM FROM BONY EXTERNAL
ACOUSTIC MEATUS
12. • MAINLY MOTOR SUPPLY IT ALSO ACCOMPANY
AURICULAR BRANCH OF VAGUS
• INNEVATE ON BOTH AURICLE ASPECT
CONCHAL DEPRESSION
OVER ITS EMINANCE
• CLOSE TO STYLOMASTOID FORAMEN FN GIVES
OFF POSTERIOR AURICULAR NERVE WHICH
SUPPLIES OCCIPITAL BELLEY OF
OCCIPITOFRONTALIS,AURICULAR
MUSCLE,POST BELLEY OF
DIGASTRIC,STYLOHYOID
13. • ENTER PAROTID GLAND FROM
POSTEROMEDIAL SURFACE AND PASS
FORWARD AND DOWNWARD BEHIND
MANDIBULAE RAMUS
• GIVES OFF TEMPEROFACIAL & CERVICOFACIAL
TRUNK
• LIES SUPERFICIAL TO RETRO MANDIBULAR
VEIN
• TRUNK BRANCHES TO FORM A PAROTID
PLEXUS “PES ANSERINUS”
• 5 TERMINAL BRANCH
14. BRANCHES
A. WITHIN FACIAL CANAL
• GREATER PETROSAL NERVE
• NERVE TO STAPEDIOUS
• CHORDAE TYMPANI
B.AS IT EXISTS STYLOMASTOID FORAMEN
• POSTERIOR AURICULAR
• DIGASTRIC
• STYLOHYOID
16. CHORDAE TYMPANI
• ARISE IN VERTICAL PART OF FACIAL CANAL
ABOUT 6MM ABOVE STYLOMASTOID
FORAMEN
• RUNS UPWARD AND FORWARD IN BONY
CANAL
• ENTERS MIDDLE EAR & RUNS FORWARD IN
CLOSE RELATION TO TYMPANIC MEMBRANE
• LEAVES MIDDLE EAR
17. • VIA PETROTYMPANIC FISSURE
• MEDIAL TO SPHENOIDAL SPINE
• ENTERS INFRA TEMPORAL FOSSA
• JOIN LINGUAL NERVE
• SUPPLIES:SUB MANDI,SUB LINGUAL GLAND
ANTERIOR 2/3RD OF TONGUE
