Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Human Anatomy ppt lectures Topic 39 Facial Nerve Notes. - anatomy ppt free download human anatomy ppt lectures, medicine notes ppt, anatomy handwritten notes pdf, mbbs 1st year anatomy notes pdf download, best anatomy notes pdf, human anatomy notes pdf, anatomy easy notes pdf, anatomy notes online, anatomy short notes, Anatomy ppt, Powerpoint Presentations and lecture notes.
Cranial nerves
?
Largest cranial nerve ? trigeminal
?
Longest cranial nerve ? vagus
?
m/c paralyzed ? facial nerve
?
m/c involved in intracranial lesions- abducent
?
Longest ? Intracanalicular course- facial
?
Dorsal aspect of brain- trochlear - most slender
?
Only motor branch of 9th cranial nerve ?
Stylopharyngeus
?
True peripheral n except- optic tract
?
Monosynaptic reflex in brain ? jaw jerk/masseteric
reflex
Cranial Nerves
Figure 13.4a
Location of cranial nerves
?Anterior cranial fossa: C.N. 1?2
?Middle cranial fossa: C.N. 3-6
?Posterior cranial fossa: C.N. 7-12
Sensory nerve
?Olfactory (1)
?Optic (2)
?Vestibulocochlear (8)
Motor nerve
?Oculomotor (3)
?Trochlear (4)
?Abducens (6)
?Accessory (11)
?Hypoglossal (12)
Mixed nerves
?Trigeminal (5)
?Facial (7)
?Glossopharyngeal (9)
?Vagus (10)
Innervation of Branchial arch
muscles ?Mixed nerves
?1 - Trigeminal
?2 - Facial
?3 - Glossopharyngeal
?4 ? Vagus - SLN
?5 ? Regresses
?6 ? Vagus - RLN
Cranial Nerve VII: Facial
? Fibers leave lower pons,
? travel through internal acoustic meatus,
? emerge through stylomastoid foramen
? to lateral aspect of face
? 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
tongue ? Chorda tympani n
Cranial Nerve VII: Facial
Table 13.2(VII)
Facial colliculus
1. Motor nucleus of facial nerve (facial nucleus)
2nd branchial arch muscles muscles of facial
expression .
2. Superior salivatory nucleus - To chorda tympani
branch joins lingual branch of Lingual n -V3 - in
Infratemporal fossa submandibular ganglion
submandibular, sublingual & acc lingual glands
3. Lacrimal nucleus - greater petrosal branch +
deep petrosal n - pterygopalatine ganglion
Lacrimal glands & paranasal sinuses
1. Geniculate ganglion
Central processes nervus intermedius
Peripheral processes chorda tympani, greater petrosal and
deep petrosal nn vidian nerve Pterygopalatine ganglion.
(some fibers join the auricular branch of the vagus)
2. Gustatory nucleus - nucleus of tractus solitarius
3. Nucleus of spinal trigeminal tract - From nervus
intermedius
Taste
Taste sensations
? Facial N.
? Glossopharyngeal N.
? Vagus N.
? Nucleus tractus solitarious
Parasympathetic ganglion
Ciliary ganglion
Pterygopalatine ganglion
Submandibular ganglion
Otic ganglion
Facial palsy-S.N.Palsy.
? CVA-internal capsule - HT
? Cortico nuclear- cortico - bulbar fibers are
involved
? Loss of movement of lower half of face on
opposite side of lesion
? Upper half of face escapes b/of bilateral
representation in cortex
? NUCLEAR PALSY-LMN type of palsy of same
side upper & lower half with ipsilateral 6th
nerve palsy ie internal squint? LR6
Facial nerve palsy
Millard Gubler syndrome - contralateral
hemiplegia & ipsilateral facial palsy b/of
pontine lesion- affects pyramidal tract &
facial nucleus.
Infra nuclear palsy - bells palsy - LMN Palsy -
same side complete face paralysis.
Internal acoustic meatus- LMN Palsy &
deafness-8th cr n.
Lesion at genu ? geniculate ganglion -
diminished lacrimation
This post was last modified on 05 April 2022