?
Longest cranial nerve ? vagus
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?
m/c paralyzed ? facial nerve
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?m/c involved in intracranial lesions- abducent
?
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Longest ? Intracanalicular course- facial
?
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Dorsal aspect of brain- trochlear - most slender?
Only motor branch of 9th cranial nerve ?
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Stylopharyngeus?
True peripheral n except- optic tract
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?
Monosynaptic reflex in brain ? jaw jerk/masseteric
reflex
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Cranial Nerves
Figure 13.4a
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Location of cranial nerves?Anterior cranial fossa: C.N. 1?2
?Middle cranial fossa: C.N. 3-6
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?Posterior cranial fossa: C.N. 7-12
Sensory nerve
?Olfactory (1)
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?Optic (2)
?Vestibulocochlear (8)
Motor nerve
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?Oculomotor (3)?Trochlear (4)
?Abducens (6)
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?Accessory (11)
?Hypoglossal (12)
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Mixed nerves?Trigeminal (5)
?Facial (7)
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?Glossopharyngeal (9)?Vagus (10)
Innervation of Branchial arch
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muscles ?Mixed nerves?1 - Trigeminal
?2 - Facial
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?3 - Glossopharyngeal
?4 ? Vagus - SLN
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?5 ? Regresses?6 ? Vagus - RLN
Cranial Nerve VII: Facial
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? Fibers leave lower pons,
? travel through internal acoustic meatus,
? emerge through stylomastoid foramen
? to lateral aspect of face
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? Pass through Parotid gland? Mixed nerve with five major branches
? Motor functions include facial expression,
? autonomic impulses to lacrimal & salivary glands
? Sensory function is taste from anterior two-thirds of
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tongue ? Chorda tympani n
Cranial Nerve VII: Facial
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Table 13.2(VII)
Facial colliculus
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1. Motor nucleus of facial nerve (facial nucleus)
2nd branchial arch muscles muscles of facial
expression .
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2. Superior salivatory nucleus - To chorda tympani
branch joins lingual branch of Lingual n -V3 - in
Infratemporal fossa submandibular ganglion
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submandibular, sublingual & acc lingual glands3. Lacrimal nucleus - greater petrosal branch +
deep petrosal n - pterygopalatine ganglion
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Lacrimal glands & paranasal sinuses1. Geniculate ganglion
Central processes nervus intermedius
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Peripheral processes chorda tympani, greater petrosal and
deep petrosal nn vidian nerve Pterygopalatine ganglion.
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(some fibers join the auricular branch of the vagus)2. Gustatory nucleus - nucleus of tractus solitarius
3. Nucleus of spinal trigeminal tract - From nervus
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intermedius
Taste
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Taste sensations
? Facial N.
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? Glossopharyngeal N.? Vagus N.
? Nucleus tractus solitarious
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Parasympathetic ganglion
Ciliary ganglion
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Pterygopalatine ganglionSubmandibular ganglion
Otic ganglion
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Facial palsy-S.N.Palsy.
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? CVA-internal capsule - HT? Cortico nuclear- cortico - bulbar fibers are
involved
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? Loss of movement of lower half of face onopposite side of lesion
? Upper half of face escapes b/of bilateral
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representation in cortex
? NUCLEAR PALSY-LMN type of palsy of same
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side upper & lower half with ipsilateral 6thnerve palsy ie internal squint? LR6
Facial nerve palsy
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Millard Gubler syndrome - contralateralhemiplegia & ipsilateral facial palsy b/of
pontine lesion- affects pyramidal tract &
facial nucleus.
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Infra nuclear palsy - bells palsy - LMN Palsy -
same side complete face paralysis.
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Internal acoustic meatus- LMN Palsy &deafness-8th cr n.
Lesion at genu ? geniculate ganglion -
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diminished lacrimation