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49 Cards in this Set
- Front
- Back
2nd Brachial arch |
Facial nerve provides innervation to structures derived from |
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Special Visceral Efferent fibers |
Striated muscles of facial expression is supplied by |
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Special Visceral Efferent fibers |
Stapedius muscle is supplied by |
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Special Visceral Efferent fibers |
Stylohyoid muscle is supplied by |
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Special Visceral Efferent fibers |
Posterior belly of digastric muscle |
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General Visceral Efferent fibers |
Form the nervus intermedius |
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General Visceral Efferent fibers |
Lacrimal gland and seromucinius glands of nasal cavity is innervated by |
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General Visceral Efferent fibers |
Submanibular and sublingual glands is innervated by |
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Special Sensory fibers |
Innervate the anterior 2/3 of the tongue via chorda tympani and tonsillar fossae and palate |
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Geniculate ganglion |
Contains the cell bodies of sensory neurons |
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Somatic Sensory fibers |
Provide sensation to touch of the external auditory canal amd co chal skin of the auricle |
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Somatic Sensory fibers |
Provide proprioceptive info from the facial muscles |
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Visceral Afferent fibers |
Supply mucisa of the nose, pharymx, and palate |
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Fallopian Canal |
Bony canal where FN traverse the temporal bone |
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Fallopian Canal |
Begins at the fundus of the internal auditory canal and terminates at the stylomastoid foramen |
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Intracranial segment |
Frontal branch component of the facial nucleus |
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Intrametal segment |
Accompanied by CN VIII, travels thru internal auditory canal to fundus |
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Intrametal segment |
Narrowest point in the bony fallopian canal |
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Intrametal segment |
Site where the nerve is most likely to become entrapped due to inflammatory swelling |
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Labyrinthine segment |
Segment after runnjng a short distance anteriorly in which the facial nerve gives off the greatest petrosal nerve |
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Tympanic segment |
Runs horizontally through the middle ear, passing above the stapes, to the aditus ad antrun near lateral semicircular canal |
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Mastoid segment |
Course through the mastoid and leaves its biny canal at the stylomastoid foramen |
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Mastoid segment |
Gives off chorda tympani, which contains the sensory gustatory fibers |
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Extracranial/Extratemporal segment |
Part after emerging the stylomastoid foramen |
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Extracranial/Extratemporal segment |
Enters the aprotid gland where it branches into the pes anserinus |
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Extracranial/Extratemporal segment |
Branches into the frontal, ophthalmic and oral branches which supllies the muscles for facial expression |
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1° Damage |
Neuropraxia |
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Neuropraxia |
Reversible conduction block |
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2° Damage |
Axonotmesis |
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Axonotmesis |
Loss of structural continuity of axon with intact endoneurial sheath |
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3° Damage |
Neurotmesis |
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Neurotmesis |
Loss of continuity of acons and endoneurial sheaths |
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5° Damage |
Complete loss of nerve continuity |
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4° Damage |
Loss of continuity of axons, sheaths, funiculus |
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Nerve Injury |
Histologic and biohemical changes occur on the nerve cell when a nerve is injured by any means, trauma or systemic changes |
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Degeneration |
Interruption of the continuity if the axon separates distal axo from metabolic source |
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Grade I |
Normal facial function in all areas |
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Grade II |
Mild Dysfunction |
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Mild Dysfunction |
Gross: light weakness noticeable on close inspection, may have very slight synkenesis |
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Mild Dysfunction |
Motion: complete closure of the eyes with minimum effort, mouth with slight asymmetry |
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Grade III |
Moderate Dysfunction |
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Moderate Dysfunction |
Gross: obvious but no disfiguring difference between 2 sides, noticeable but no severe synkinesis, contracture or hemifacial spasm |
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Moderate Dysfunction |
Motion: slight to moderate movement of forehead, complete closure of eyes with effort, mouth slightly weak with max effort |
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Moderately-severe dysfunction |
Gross: obvious weakness or disfiguring asymmetry |
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Moderately-severe dysfunction |
Motion: no in forehead, incomplete closure of eyes, mouth asymmetric with max effort |
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Severe dysfunction |
Gross: only barely perceptivle motion |
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Severe dysfunction |
Motion: no in forehead, incomplete closure of eyes, mouth with slight movement |
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Total Paralysis |
No movement |
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Schirmer's test |
Test in which the physician places a folded strip of sterile filter paper into the conjunctival fornix of each eye and compares rate of tear production of 2 sides |