cranial nerve vii
Post on 14-Apr-2017
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CRANIAL NERVE VII
FACIAL NERVE(Nerve of second pharyngeal arch)
FUNCTIONS:
1. Special sensory (Taste)
2. General (somatic) sensory
3. Somatic (branchial) motor
4. Visceral (parasympathetic motor)
ORIGIN: From junction of pons and medulla As two divisions:
1. Motor root: innervates muscle of facial expression
2. Intermediate root: carries taste, parasympathetic and somatic sensory fibers
NUCLEUS:
1. Branchiomotor nucleus
2. Superior salivatory nucleus (Parasympathetic)
3. Lacrimatory nucleus (Parasympathetic)
4. Nucleus of Tractus Solitarius (Sensory)
COURSE: It crosses the posterior cranial fossa and leaves the
cranial cavity through the internal acoustic meatus then enters the facial canal in in petrous part of temporal bone. Near this point there is sharp bend called GENICULUM OF FACIAL NERVE site of geniculate ganglion. Finally it exists through stylomastoid foramen and give its branches.
BRANCHES: Within facial canal it gives:
1. Greater petrosal nerve
2. Nerve to stapedius
3. Chorda tympani nerve
From stylomastoid foramen it gives:
4. Digastric nerve
5. Posterior auricular nerve
6. Stylohyoid nerve
At Face:
7. Temporal Nerve
8. Zygomatic nerve
9. Buccal nerve
10. Mandibular nerve
11. Cervical nerve
SOMATIC MOTOR:Supplies muscle of facial expression and auricular muscles. Also supplies posterior bellies of digastric, stylohyoid and stapedius muscle.
VISCERAL MOTOR:
Provides parasympathetic fibers to pterygopalatine ganglion for innervation of lacrimal glands and to submandibular ganglion for innervation of submandibular and sublingual glands.
SOMATIC SENSORY:
Supply skin of concha of auricle
SPECIAL SENSORY:
Fibers carried by chorda tympani join the lingual nerve to carry taste sensation from anterior two thirds of tongue and soft palate
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