cranial nerves
DESCRIPTION
Cranial Nerves. Cranial Nerves. Special Sense Nerves I,II,VIII Somatic Motor Nerves Eye—III,IV,VI Tongue--XII “Rest of body” nerves IX,X,XI Face and jaws VII, V. Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves. Head I: Skull—a framework to hang on - PowerPoint PPT PresentationTRANSCRIPT
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Cranial Nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
Cranial Nerves Special Sense Nerves
I,II,VIII Somatic Motor Nerves
Eye—III,IV,VITongue--XII
“Rest of body” nervesIX,X,XI
Face and jawsVII, V
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
Head I: Skull—a framework to hang on Overall organization of skull Base of the skull—the hard part
Developmental view Cranial nerves out (to “targets”)
Head II: Throat targets Head III: Special Sense targets Head IV: Cranial nerves in depth
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
Nerve “targets” in head SENSORYSpecial GeneralSmell skinVision teethHearing eye
tongueoral cavitynasal cavitymiddle earthroatmeninges
MOTORMuscles Glandseyes salivary
extrinsic sweatintrinsic lacrimal
jaws mucousfacial expressionlarynxtonguethroatear
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
Base of the skull—cranial nerves out Ethmoid (olfactory)
I. Olfactory Sphenoid (optic)
II. OpticIII. OculomotorIV. TrochlearVI. Abducens
Temporal (otic)VII. Acoustic/Auditory/
Vestibulocochlear Face/Jaws
V. TrigeminalVII. Facial
Throat (rest of body)IX GlossopharyngealX. VagusXI. Spinal AccessoryXII. Hypoglosal
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Cranial nerves
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Cranial nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
Special Sense Nerves
Internal auditory meatus (temporal)
Inner earVIII. Auditory
Optic canal (sphenoid)
RetinaII. Optic
Cribiform plate (ethmoid)
Olfactory epithelium
I. Olfactory
EXIT FROM CRANIAL CAVITY
TARGETNERVE
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
M&M, Table 14.3
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
Somatic Motor Nerves(eye muscles and tongue)
EXIT CR. CAVITYTARGETNERVE
Hypoglossal canal(occipital)
Intrinsic, extrinsic mm. of tongue
XII. Hypoglossal
“•Sup.,med.,inf.rectus• Inferior Oblique•Levator palpebrae superioris
III. Oculomotor(Also parasympathetic to ciliary mm, constrictor pupillae)
“Lateral rectusVI. Abducens
Sup. Orbital fissure (sphenoid)
Superior oblique m. (with trochlea)
IV. Trochlear
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Cranial nerves
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Cranial nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
“Rest of body” nerves(all exit from jugular foramen)
NERVE TARGET
X: Vagus Somatic motor to larynx/pharynx Parasympathetic to most of gut Taste to back posterior pharynx
XI: (Spinal) Accesory
Motor to traps, sternocleidomastoid
IX: Glosso-pharyngeal
Sensory to carotid body/sinus Taste to posterior tongue Sensory to ear opening/middle
ear Parotid salivary gland
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
VII: Facial Nerve(exits cranial cavity with VIII--internal auditory meatus)
Facial muscles (five branches fan out over face from stylomastoid foramen)
Temporal Zygomatic Buccal Mandibular Cervical
“chorda tympani” (crosses interior ear drum to join V3 )
Taste to anterior 2/3 of tongue Submandibular, sublingual salivary glands
Lacrimal glands
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
V: Trigeminal (3 nerves in 1!)
V1. Ophthalmic Exits with eye muscle group (superior orbital fissure, through
orbit to superior orbital notch/foramina) Sensory to forehead, nasal cavity
V2. Maxillary Exits foramen rotundum through wall of maxillary sinus to
inferior orbital foramina) Sensory to cheek, upper lip, teeth, nasal cavity
V3. Mandibular Exits foramen ovale to mandibular foramen to mental
foramen Motor to jaw muscles--Masseter, temporalis, pterygoids,
digastric Sensory to chin Sensory to tongue
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Human Anatomy, Frolich, Head/Neck IV: Cranial Nerves
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Cranial Nerves I: Olfactory II: Optic III: Oculomotor IV: Trochlear V: Trigeminal VI: Abducens
VII: Facial VIII:Vestibulocochlear
Acoustic IX:
Glossopharyngeal X: Vagus XI: Accessory XII: Hypoglossal
http://www.gwc.maricopa.edu/class/bio201/cn/cranial.htm
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Mnemonic On Old Olympus’ Tower Top A
Fin And German Viewed A Hop
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MNEMONIC OLFACTORY OPTIC OCULOMOTOR TROCHLEAR TRIGEMINAL ABDUCENS FACIAL VESTIBULOCOCHLEAR GLOSSOPHARYNGEAL VAGUS ACCESSORY HYPOGLOSSAL
OH ONCE ONE TAKES THE ANATOMY FINAL VERY GOOD VACATION A-HEAD
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CN I: OLFACTORY Cranial nerve I Function:
smell Clinical test for
damage: determine whether
a person can smell something aromatic
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CN II: OPTIC Cranial nerve II Function:
vision Clinical test for
damage: tests peripheral vision
and visual acuity Effects of damage:
blindness in part or all of the visual field
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CNIII: OCULOMOTOR Cranial nerve III Function:
eye movements, opening of eyelid, constriction of pupil, focusing, proprioception
Clinical tests for injury: differences in pupil size; pupillary
response to light; eye tracking Effects of damage
dropping eyelid, dilated pupil, double vision
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CNIV: TROCHLEAR Cranial nerve IV Function: eye
movements and proprioception
Clinical test for injury: ability to rotate eye inferolaterally
Effects of damage – double vision, patient tilts head toward affected side
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CN V: TRIGEMINAL Cranial nerve V Function: sensory nerve of
the face Clinical test for injury:
corneal reflex; sense of touch, pain, and temperature; clench teeth; move mandible side to side
Effects of damage: loss of sensation and
impaired chewing
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CN VI: ABDUCENS AND CN VII: FACIAL
Cranial Nerve VI Function: Eye
movements Clinical test: lateral
eye movement Effects of damage:
inability to rotate eye laterally; at rest – eye rotates medially because of action of antagonistic muscles
Cranial Nerve VII Function: facial
expression; sense of taste
Clinical test: motor functions – close eyes, smile, whistle, frown, raise eyebrows; taste
Effects of damage: inability to control facial muscles; distorted sense of taste
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CN VIII: VESTIBULOCOCHLEAR Cranial Nerve VIII Function: hearing and equilibrium Clinical tests: test hearing, balance,
and ability to walk a straight line Effects of damage: deafness,
dizziness, nausea, loss of balance, and nystagmus
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CN IX: GLOSSOPHARANGEAL AND CN X: VAGUS
Cranial Nerve IX Function: swallowing,
salivation, gagging; touch, pressure, taste, and pain sensations from tongue, pharynx, and outer ear
Clinical tests: gag reflex, swallowing, and coughing
Effects of damage: difficulty swallowing
Cranial Nerve X Function: swallowing;
taste; speech; respiratory, CV, and GI regulation; sensations of hunger, fullness, and intestinal discomfort
Clinical tests: test with cranial nerve IX
Effects of damage: hoarseness or loss of voice; impaired swallowing and GI motility
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CN XI: ACCESSORY AND CN XII: HYPOGLOSSAL
Cranial Nerve XI Function: swallowing;
head, neck, and shoulder movements
Clinical tests: rotate head and shrug shoulders against resistance
Effects of damage: impaired movement of head, neck, and shoulders; paralysis of sternocleidomastoid
Cranial Nerve XII Function: tongue
movements of speech, food manipulation, and swallowing
Clinical test: tongue function
Effects of damage: difficulty in speech and swallowing; atrophy of tongue; inability to stick out (protrude) tongue