Dr. ayat eldomouky. Ⅰ Olfactory nerve Ⅱ Optic nerve Ⅲ Oculomotor nerve Ⅳ Trochlear nerve...
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Transcript of Dr. ayat eldomouky. Ⅰ Olfactory nerve Ⅱ Optic nerve Ⅲ Oculomotor nerve Ⅳ Trochlear nerve...
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Cranial nervesDr. ayat eldomouky
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Names of cranial nerves Ⅰ Olfactory nerve Ⅱ Optic nerve Ⅲ Oculomotor nerve Ⅳ Trochlear nerve Ⅴ Trigeminal nerve Ⅵ Abducent nerve Ⅶ Facial nerve Ⅷ Vestibulocochlear
nerve Ⅸ Glossopharyngeal
nerve Ⅹ Vagus nerve Ⅺ Accessory nerve Ⅻ Hypoglossal nerve
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Classification of cranial nerves Sensory cranial nerves: contain only afferent (sensory)
fibers◦ ⅠOlfactory nerve ◦ ⅡOptic nerve◦ Ⅷ Vestibulocochlear nerve
Motor cranial nerves: contain only efferent (motor) fibers◦ Ⅲ Oculomotor nerve ◦ Ⅳ Trochlear nerve ◦ ⅥAbducent nerve ◦ Ⅺ Accessory nerve◦ Ⅻ Hypoglossal nerve
Mixed nerves: contain both sensory and motor fibers--- ◦ ⅤTrigeminal nerve, ◦ Ⅶ Facial nerve,◦ ⅨGlossopharyngeal nerve◦ ⅩVagus nerve
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Cranial Nerve I: Olfactory Arises from the olfactory epithelium in
upper part of nasal cavity. Passes through the cribriform plate of the
ethmoid bone Fibers run through the olfactory bulb and
terminate in the primary olfactory cortex Functions solely by carrying afferent
impulses for the sense of smell
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Olfactory nerves
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Olfactory nerve
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Olfactory nerves
Olfactory bulb
Olfactory tracts
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Cranial Nerve II: Optic Arises from the retina of the eye Optic nerves pass through the optic canals
and converge at the optic chiasma
Functions solely by carrying afferent impulses for vision
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Cranial Nerve II: Optic
Figure II Table 13.2
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Optic nerve
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The optic canal
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Optic chiasmsa
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Cranial Nerve V: Trigeminal nerve: roots (large sensory and small motor)
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Trigeminal ganglion
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Trigeminal divisions
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Branches Ophthalmic nerve
(Ⅴ1, purly sensory) leave the skull through the superior orbital fissure, to enter orbital cavity
Branches◦ Frontal nerve
Supratrochlear nerve Supraorbital nerve
◦ Lacrimal nerve◦ Nasociliary nerve Anterior ethmoidal Internal and external
nasal Infratrochlear Posterior ethmoidal ciliary
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Maxillary nerve (Ⅴ2, sensory)
Leave skull through foramen rotundum
Branches◦ Infraorbital nerve◦ Zygomatic nerve◦ 3 Superior alveolar
nerve◦ Ganglionic
Pterygopalatine nerves
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Mandibular nerve (Ⅴ3, mixed)
Leave the skull through the foramen ovale to enter the infratemporal fossa
BranchesPost. Division: 1. Auriculotemporal nerve2. Lingual nerve3. Inferior alveolar nerve◦ ant. Division: 1. Nerve of masticatory
muscles2. Buccal nerve
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Mandibular nerve
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Otic ganglion
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Auriculotemporal nerve
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Lingual nerve
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Submandibular ganglion
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Inferior alveolar nerve
Nerve to mylohyoid
muscle
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Facial nerve
Roots : motor root
Sensory root(nervus
intermedius )
V111
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internal acoustic meatus facial canal in inner ear stylomastoid foramen
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Facial nerve in ear
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Pterygopalatine ganglion
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Roots :
•From the maxillary nerve which arises from the trigeminal ganglion
Sensory root
•From the greater petrosal nerve ( from the facial nerve)
parasympathetic root
•From the deep petrosal nerve ( from the nerve plexus around the internal carotid artery )
Sympathetic root
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Branches:
1.orbital branches
2.nasal branches
3.palatine branches
4.pharyngeal branches
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Facial nerve distribution
Greater petrosal nerve
Nerve to stapedius
Chorda tympani
Posterior auricular
nerve
Nerve to posterior belly of digastric muscle
Five terminal branches
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Chorda tympani nerve
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Cranial Nerve VIII: Vestibulocochlear Fibers arise from the hearing and
equilibrium apparatus of the inner ear, pass through the internal acoustic meatus,
Two divisions – cochlear (hearing) and vestibular (balance (equilibrium))
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Cranial Nerve VIII: Vestibulocochlear
Figure VIII from Table 13.2
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Cranial Nerve IX: Glossopharyngeal Fibers emerge from the medulla, leave the
skull via the jugular foramen, and run to the throat
Nerve IX is a mixed nerve with motor and sensory functions
Motor – innervates part of the tongue and pharynx, and provides motor fibers to the parotid salivary gland
Sensory – fibers conduct taste and general sensory impulses from the tongue and pharynx
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Cranial Nerve IX: Glossopharyngeal
Figure IX from Table 13.2
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Cranial Nerve X: Vagus
The only cranial nerve that extends beyond the head and neck
Fibers emerge from the medulla via the jugular foramen
The vagus is a mixed nerve Most motor fibers are parasympathetic
fibers to the heart, lungs, and visceral organs
Its sensory function is in taste Paralysis leads to hoarseness Total destruction incompatible with life
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Cranial Nerve X: Vagus
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Cranial Nerve XI: Accessory Formed from a cranial root emerging from
the medulla and a spinal root arising from the superior region of the spinal cord
The spinal root passes upward into the cranium via the foramen magnum
The accessory nerve leaves the cranium via the jugular foramen
Primarily a motor nerve ◦ Cranial root: Supplies fibers to the larynx,
pharynx, and soft palate◦ Spinal root: Innervates the trapezius and
sternocleidomastoid, which move the head and neck
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Cranial Nerve XI: Accessory
Figure XI from Table 13.2
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Cranial Nerve XII: Hypoglossal
Fibers arise from the medulla and exit the skull via the hypoglossal canal
Innervates both extrinsic and intrinsic muscles of the tongue except palatoglossus, which contribute to swallowing and speech
If damaged, difficulties in speech and swallowing; inability to protrude tongue
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Cranial Nerve XII: Hypoglossal
Figure XII from Table 13.2
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
Work sheet: Cranial Nerves• Special Sense Nerves
–I,II,VIII•Motor Nerves
–Eye—III,IV,VI–Tongue—XII–Palate, pharynx,larynx---XI
• “Rest of body” nerves–IX,X– Face and jaws–VII, V
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Sensory cranial nervesN. nerves Cranial exit Main action
I Olfactory cells Cribrifomforamina
Smell
II Optic nerve Optic canal Vision
VIII Vestibular ganglion Internal acoustic meatus
Equilibrium
Cochlear ganglion Hearing
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Motor cranial nerves
N. Nerves Cranial exit Main action
III Occulomotor nerve Superior orbital fissure
Motot to most of extraoccular muscles
Parasympathetic to ciliary ganglion
IV trochlear nerve Superior orbital fissure
Motor to superior obliquus
VI Abducent nerve Superior orbital fissure
Motor to lateral rectus
XI Spinal accessory nerve
Jugular foramen sternocleidomastoid and trapezius
Cranial accessory nerve
Muscles of palate, pharynx and larynx
XII hypoglossal nerve Hypoglossal canal
Motor to muscles of tongue
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Mixed cranial nervesN. nerves Cranial exit
V Trigeminal nerve,
Ophthalmic nerve
Superior orbital fissure
Maxillary nerve Foramen rotundum
Mandibular nerve
Foramen ovale
VI Facial nerve Internal acoustic meatus
IX Glossopharyngeal nerve Jugular foramen
X Vagus
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Important nerves1. ophthalmic nerve Begin: as one branch of trigeminal ganglion End: divided into 3 branches enter the orbit
through superior orbital fissure Branches:
A. lacrimal nerveB. Frontal nerve: end as supratrochleal and
supra orbital nervesC. Nasociliary nerve, give the following nerves; 1. anterior and posterior ethmoidal , 2. external and internal nasal3. infratrochlear nerve
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Important nerves2. maxillary nerve Begin: as one branch of trigeminal ganglion End: pass through foramen rotundum then
enter the orbit and end as infraorbital nerve Branches:
A. zygomatic nerveB. ganglionic nerve C. Post. Superior alveolar nervesD. middle Superior alveolar nervesE. ant. Superior alveolar nervesF. Infraorbital nerve
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Important nerves3. mandibular nerve Begin: as one branch of trigeminal ganglion End: enter the infratemporal fossa through the foramen
ovale then divided into ant. And post. Division Branches of trunk: nerve to medial pterygoid muscle Branches of ant. division:
1. Masseteric nerve2. Deep temporal nerve3. Buccal nerve4. Nerve to lateral ptrygoid muscle Branches of post. division:
1. Auriculotemporal nerve2. Lingual nerve3. Inferior alveolar nerve
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Important nerves4. lingual nerve Begin: as one branch of post. Division of
mandibular nerve End: descend medial to ramus of the mandible
then runs forward to the tongue Branches:
A. Carries general sensation of ant. 2/3 of the tongue
B. Joined with chorda tympani (branch of facial nerve) which carries taste sensation of ant 2/3 of tongue, also carries preganglionic parasympathetic fibers to sublingual and submandibular salivary glands
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Important nerves5. inferior alveolar nerve Begin: as one branch of post. Division of
mandibular nerve End: enter the mandibular canal and
emerge from mental foramen as mental nerve
Branches: A. Sensory to the lower teethB. Nerve to mylohyoid muscleC. Mental nerve
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Important nerves6. facial nerve Begin: the 7th crasnial nerve start as motor and
sensory roots End: enter parotid gland then divided into 5
branches Branches:
1. Grater petrosal nerve.2. Chorda tympanic nerve3. Nerve to stapedius4. Posterior auricular nerve5. 5 terminal: temporal, zygomatic, buccal,
mandibular and cervical branches
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Important nerves6. hypoglossus nerve Begin: the last cranial nerve End: pass forward lateral to carotid sheath
to reach the tongue Branches:
Muscular branches to all muscles of the tongue except palatoglossus muscle
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Parasympathetic ganglions1. pterygopalatine ganglion Site: pterygopalatine fossa Parasympathetic root (preganglionic):
greater petrosal nerve branch from facial nerve
Branches (postganglionic): 1. orbital branches 2. nasal branches 3. greater and lesser palatine branch4. pharyngeal branch
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Parasympathetic ganglions2. 0tic ganglion Site: infratemoral fossa Parasympathetic root (preganglionic): lesser
petrosal nerve branch from glossopharyngeal nerve
Branches (postganglionic): Reach the parotid gland through auriculotemporal nerve
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Parasympathetic ganglions3. submandibular ganglion Site: submandibular triangle Parasympathetic root (preganglionic):
chorda tympanic nerve branch from facial nerve
Branches (postganglionic): Reach the submandibular and sublingual glands
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All muscles of mastication innervated by mandibular nerve
All branches of anterior division of mandibular nerve are motor except buccal nerve
All branches of posterior division of mandibular nerve are sensory except nerve to mylohyoid muscle
Important notes MCQ
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The glossopharyngeal nerve is-------------1. Purely sensory2. Purely motor 3. Mixed nerve4. None of above
The facial nerve is--------------------1. Purely sensory 2. Purely motor3. Mixed nerve4. None of above
Ex. For important MCQ
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The hypoglossal nerve is------------------1. Purely sensory2. Purely motor3. Mixed nerve
Which of the following nerve is the contiuation of the maxillary nerve -----------------
1. Lacrimal nerve2. Frontal nerve3. Nasociliary nerve4. Infraorbital nerve
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The posterior division of mandibular nerve give rise to all of the following except
1. lingual nerve2. inferior alveolar nerve3. superior alveolar nerve4. auriculotemporal nerve
The posterior division of the mandibular nerve innervates which of the following muscles:
1. medial pterygoid muscle2. stylohyoid muscle3. mylohyoid muscle4. omohyoid muscle
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chorda tympani nerve contains preganglionic parasympathetic fibers that synapse in……..
1. Pterygopalatine ganglion2. Otic ganglion3. Ciliary ganglion4. Submandibular ganglion
Greater petrosal nerve contains preganglionic parasympathetic fibers that synapse in……..
1. Pterygopalatine ganglion2. Otic ganglion3. Ciliary ganglion4. Submandibular ganglion
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Lesser petrosal nerve contains preganglionic parasympathetic fibers that synapse in……..
1. Pterygopalatine ganglion2. Otic ganglion3. Ciliary ganglion4. Submandibular ganglion
Oculomotor nerve contains preganglionic parasympathetic fibers that synapse in……..
1. Pterygopalatine ganglion2. Otic ganglion3. Ciliary ganglion4. Submandibular ganglion
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The trochelar nerve leaves the skull through…………1. Superior orbital fissure2. Foramen rotundum3. Foramen ovale4. Foramen spinosum The accessory nerve leaves the skull through…………1. Superior orbital fissure2. Foramen rotundum3. Hypoglossal canal4. Jugular foramen
The mandibular nerve leaves the skull through…………1. Superior orbital fissure2. Foramen rotundum3. Foramen ovale4. Foramen spinosum
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The vagus nerve leaves the skull through…………1. Superior orbital fissure2. Foramen rotundum3. Hypoglossal canal4. Jugular foramen The spinal root of accessory nerve
innervates-----------1. Sternomastoid muscle2. Trapezius muscle3. Both a,b4. Neither a or b
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Which of the following nerves carry smell sensation from nasal mucosa
1. Lateral nasal nerve2. nasoplatine nerve3. sphenopalatine nerve4. olfactory nerve
Which of the following nerves carry visual sensation from the retina
1. Optic nerve2. Occulomotor nerve3. Trochlear nerve4. Abducent nerve
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Which of the following statement concerning the lingual nerve is correct?
1. It contains parasympathetic postganglionic fibers.2. It contains special sensory (taste) fibers from
pos1/3 of tongue.3. It joins the chorda tympani nerve in the
infratemporal fossa.4. It is a branch of the facial nerve in the temporal
bone.
The following statements concerning the chorda tympani are correct except which?
1. It contains parasympathetic postganglionic fibers.2. It contains special sensory (taste) fibers.3. It joins the lingual nerve in the infratemporal
fossa.4. It is a branch of the facial nerve in the temporal
bone.
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The branches of the posterior division of the mandibular nerve are sensory except:
1. Lingual nerve2. Inferior alveolar nerve3. Auriculotemporal nerve.4. Nerve to mylohyoid muscle.