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9. CRANIAL NERVES
12 pairs, arising directly from brain
CN I & CN II → CEREBRUM
Remaining ten arise from Different parts of brain stem (mid brain, pons,medulla)
10.
11.
12. CLASSIFICATION
Sensory
olfactory CN I
optic CN I
vestibulocochlear CNVIII
Motor
Oculomotor CN III
Trochlear CN IV
Abducent CNVI
Accessory CN XI
Hypoglossal CN XII
Mixed
Trigeminal CNV
Facial CNVII
Glossopharyngeal CN IX
Vagus CN X
13. Sensory (afferent) modalities:
General somatic sensory (GSS) – general sensation from skin.
General visceral sensory (GVS) – general sensation from viscera.
Special somatic sensory (SSS) – senses derived from ectoderm (e.g.
sight, sound, balance).
Special visceral sensory (SVS) – senses derived from endoderm (e.g.
taste, smell).
Motor (efferent) modalities:
General somatic motor (GSM) – skeletal muscles.
General visceral motor (GVM) – smooth muscles of gut and
autonomic motor.
Special visceral motor (SVM) – muscles derived from pharyngeal
arches.
14.
15.
16. CN- I OLFACTORY NERVE
Sensory Nerve
Carries impulses of Sense of Smell
Sensory fibers in olfactory epithelium project through
olfactory foramina of ethmoid bone to synapse in
olfactory bulb; olfactory tract enters cerebral
hemispheres and terminates in primary olfactory
cortex on medial temporal lobe
Lesions of fibers or fracture of ethmoid can lead to
anosmia (loss of sense of smell)
tumour, common cold, fracture of ethmoid, old age
How toTest?
17. CN II OPTIC NERVE
• Sensory Nerve
CarriesVisual Impulses
• Fibers from retina form optic nerve, through optic
canal; partial crossover of fibers at optic chiasma,
continue as optic tracts to thalamus where they
synapse with fibers heading to occipital visual cortex|
Lesions/Injury may lead to Blindness,Visual field
defects,
20. CN III OCCULOMOTOR NERVE
Motor
Arises from Anterior Surface of
Midbrain
Passes through Superior Orbital
Fissure into orbit.
Movement of eye ball
(Upward,Downward & Medially) ,
constriction of pupil, accommodation,
Raises upper eyelid.
Innervates EOM (LPS,IR,MR,IO,SR)
21.
22.
23.
24. CN IVTROCHLEAR NERVE
midbrain through superior orbital fissures to eyes
Primarily motor ,somatic motor fibers to one extrinsic eye muscle
Supplies SO
Moves eyeball
25. CNVTRIGEMINAL NERVE
MIXED Sensory & Motor
Arises lateral aspect of pons
Trigeminal (sensory) ganglion in depression
on temporal bone.
Chewing and grind food: the muscles of
mastication
• Splits into
ophthalmic (Va), The ophthalmic nerve
transmits sensory fibres from the eyeball,
the skin of the upper face and anterior scalp,
the lining of the upper part of the nasal
cavity and air cells, and the meninges of the
anterior cranial fossa
maxillary (Vb)
mandibular (Vc)
Shingles and varicella-zosteras
Trigeminal Neuralgia
26. Branches
ophthalmic nerve
sensory fibres from the eyeball, the
skin of the upper face and anterior
scalp, the lining of the upper part of
the nasal cavity
• THREE SUB BRANCHES
frontal (largest),
nasociliary
lacrimal (smallest)
27. THE MAXILLARY NERVE (Vb)
only sensory fibres
skin of the face between the
palpebral fissure and the mouth,
from the nasal cavity and sinuses,
and from the maxillary teeth
28. T H E M A N D I B U L A R N E RV E (V-C
mixed sensory and motor
nerve.
the skin over the mandible,
side of the cheek and temple,
the oral cavity and contents,
the external ear the tympanic
membrane and
temporomandibular joint
(TMJ)
31. VII FACIAL NERVE
Mixed Nerve
Arises from (pons), enters the middle ear and mastoid and exits the skull at the
stylomastoid foramen
Passes via posterior cranial fossa, enters internal acoustic meatus
supplies the muscles of facial expression
taste sensation from the anterior portion of the tongue and oral cavity
Intra cranial & Extracranial Part
parasympathetic secretomotor function of the salivary, lacrimal, nasal and
palatine glands
32.
33.
34. EXTRA CRANIAL
• Posterior auricular nerve –
• Nerve to the posterior belly of
the digastric muscle
• Nerve to the stylohyoid muscle
35.
36.
37.
38. PARASYMPATHETIC NERVES
Greater Petrosal Nerve - this provides parasympathetic fibres to lacrimal glands
of the eye and mucus membrane of the nasal cavity and palate
Nerve branch to the Stapedius muscle in the middle ear which reflexively
stabilises the tympanic membrane during sudden loud sounds
ChordaTympani - contains special sensory fibres which supply taste sensation for
the anterior 2/3 of the tongue as well as parasympathetic fibres to the
submandibular and sublingual salivary glands
39.
40. INTRACRANIAL LESION
Damage during cranium coarse
Bells Palsy
Damage to Chorda tympani → Loss of taste, decreased salvation
Damage to greater petrosal N. → reduced lacrimation
Damage to Nerve to stapedius → Hypersensitive to sound
41. BELLS PALSY
neurological disorder that causes paralysis or weakness on
one side of the face
•Sudden weakness or paralysis on one side of your
face
•A drooping eyebrow and mouth
•Drooling from one side of your mouth
•Difficulty closing an eyelid, which causes eye
dryness
42.
43. CNVIIIVESTIBULOCOCHLEAR NERVE
purely sensory/ Special somatic afferent
vestibular fibres and cochlear fibres
enter the internal acoustic meatus along with
(lateral to) 7th (facial) nerve.
Vestibular component – arises from the
vestibular nuclei complex in the pons and
medulla
associated with body posture ,balance and
coordination of head
Cochlear component – arises from the ventral
and dorsal cochlear nuclei, situated within the
medulla.
associated with hearing
44.
45.
46. HAIR CELLS-→COCHLEA
HAIR CELLS→ Semi-Circular canal
symptoms of vestibular nerve damage:
Vertigo – a false sensation that oneself or the surroundings are spinning or
moving.
Nystagmus – a repetitive, involuntary to-and-fro oscillation of the eyes.
Loss of equilibrium (especially in low light).
Nausea and vomiting.
47.
48.
49. CN IX GLOSSOPHARYNGEAL NERVE
sensory, Provides taste sensation to the posterior 1/3 of the tongue
motor, Innervates the stylopharyngeus muscle of the pharynx.
parasympathetic functions Innervates the stylopharyngeus muscle of the
pharynx.
originates from the medulla oblongata and terminates in the pharynx
exits the skull via the jugular foramen
the facial nerve splits into its five terminal branches in the parotid gland, it is the
glossopharyngeal nerve that actually supplies the gland.
50.
51.
52.
53. Gag Reflex compromised
as stylopharyngeus muscle of the pharynx is innervated by the glossopharyngeal
nerve.This muscle acts to shorten and widen the pharynx and elevate the larynx
during swallowing.
54. CN XVAGUS NERVE
Mixed nerve
Originates from the medulla
means wandering, goes all the way to abdomen
longest and most widely distributed cranial nerve
principal role of the vagus is to provide parasympathetic supply to organs throughout the
thorax and upper abdomen.
also gives sensory and motor supply to the pharynx and larynx
vagus nerve leaves the skull via the jugular foramen
vagus nerve descends in the neck, enclosed with the carotid vessels and internal jugular
vein in a common sheath of connective tissue
left and right vagal nerves join to form the vagal trunk
55.
56.
57.
58.
59. motor supply to all the muscles of the larynx, except the cricothyroid.
Injury will in thyroidectomy will lead to hoarseness of voice or complete loss of
voice
60. digestion
heart rate
breathing
cardiovascular activity
reflex actions, such as coughing, sneezing, swallowing, and vomiting
61.
62. The tympanic branch of glossopharyngeal supplies:
A- parotid gland
B- pineal gland
C- pituitary gland
D- sublingual gland
A patient was shown to have absent gag reflex.Which nerve is most likely affected:
A- facial
B- vagus
C- glossopharyngeal
63. CN XI ACCESSORY SPINAL
Cranial division and spinal division
Motor
Exits the jugular foramen
trapezius and the sternocleidomastoid muscles
64. CN XII HYPOGLOSSAL NERVE
Arises from Medulla
motor nerve to the muscles of the tongue
65.
66. The Accessory Nerve exit from which foramen in the skull ?
A- Foramen ovale
B- Foramen Lacerum
C- Jugular Foramen
D- Foramen Magnum