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Name cranial nerve I
Olfactory
Name cranial nerve II
Optic
Name cranial nerve III
Oculomotor
Name cranial nerve IV
Trochlear
Name cranial nerve V
Trigeminal
Name cranial nerve VI
Abducens
Name cranial nerve VII
Facial
Name cranial nerve VIII
Vestibulocochlear
Name cranial nerve IX
Glossopharyngeal
Name cranial nerve X
Vagus
Name cranial nerve XI
Accessory
Name cranial nerve XII
Hypoglossal
What modality is cranial nerve I (olfactory nerve)?
Purely sensory
What is the origin/target of cranial nerve I (olfactory nerve)?
Telencephalon
What is the nucleus of cranial nerve I (olfactory nerve)?
Anterior olfactory nucleus
What is the function of cranial nerve I (olfactory nerve) ? (1)
  • Transmits the sense of smell from the nasal cavity (carries information from the olfactory bulb to the olfactory areas of the cerebral cortex)
Describe what cranial nerve I (olfactory nerve) passes through?
Located in the olfactory foramina in the cribiform plate of the ethmoid bone
Explain whether cranial nerve I (olfactory nerve) is actually a cranial nerve.
Technically, it is actually a CNS tract.
What is the modality of cranial nerve II (optic nerve)?
Sensory
What is the origin/target of cranial nerve II (optic nerve)?
Retinal ganglion cells
What is the nucleus of cranial nerve II (optic nerve)?
Lateral geniculate nucleus
What is the function of cranial nerve II (optic nerve)?
Transmits visual signals from the retine of the eye to the brain
Where is cranial nerve II (optic nerve) located?
Optic canal
Is cranial nerve II (optic nerve) really a nerve?
After the optic chiasm, it is technically a CNS tract.
What is the modality of cranial nerve III (oculomotor)?
Mainly motor
What is the origin/target of cranial nerve III (oculomotor)?
Anterior aspect of brain
Name the nuclei of cranial nerve III (oculomotor nerve)? (2)
  • Oculomotor nucleus (GSE)
  • Edinger-Westphal nucleus (GVE)
What is the function of cranial nerve III (oculomotor nerve)?
Controls eye muscles (responsible for most eye movements)
  • Levator palpebrae superioris
  • Superior rectus
  • Medial rectus
  • Inferior rectus
  • Inferior oblique
Controls pupillary muscle
  • Sphincter pupillae
What is the location of cranial nerve III (oculomotor nerve)?
Superior orbital fissure
What is the modality of cranial nerve IV (trochlear)?
Motor
What is the origin/target of cranial nerve IV (trochlear)?
Dorsal aspect of midbrain
What is the nucleus of cranial nerve IV (trochlear)?
Trochlear nucleus (carries GSE fibers)
What is the function of cranial nerve IV (trochlear)?
Innervates the superior oblique muscle which:
  • Depresses contralateral eyeball
  • Intorts contralateral eyeball
  • Laterally rotates contralateral eyeball
What is the location of cranial nerve IV (trochlear)?
Superior orbital fissure
Cranial nerve IV (trochlear) is the only nerve to come out of which side of the brain?
Posterior
What is the modality of cranial nerve V (trigeminal)?
  • Sensory
  • Motor
What is the origin/target of cranial nerve V (trigeminal)?
Pons
What are the nuclei of cranial nerve V (trigeminal)? (4)
  • Principal sensory trigeminal nucleus (touch)
  • Spinal trigeminal nucleus (pain, temperature)
  • Mesencephalic trigeminal nucleus (proprioception)
  • Trigeminal motor nucleus (SVE for mastication)
What are the functions of cranial nerve V (trigeminal)? (2)
  • Sensations from the face
  • Innervation of muscles of mastrication
What are the 3 branches of cranial nerve V (trigeminal) and where are the branches located?
V1 = Opthalmic nerve (superior orbital fissure)
V2 = Maxillary nerve (foramen rotundum)
V3 = Mandibular nerve (foramen ovale)
What is the modality of cranial nerve VI (abducens)?
Mainly motor
What is the origin/target of cranial nerve VI (abducens)?
Nuclei lying under the floor of 4th ventricle (pons)
What is the nucleus of cranial nerve VI (abducens)?
Abducens nucleus
  • Within pons near midline 
What is the function of cranial nerve VI (abducens)?
Innervates lateral rectus (abducts eye)
What is the modality of cranial nerve VII (facial)?
  • Sensory
  • Motor 
What is the origin/target of cranial nerve VII (facial)?
Pons
What are the nuclei for cranial nerve VII (facial nerve)? (3) What 2 components of the facial nerve run to them? Describe the relationship.

Facial nerve proper (component of the facial nerve) arises from:
  • Facial nucleus (gives rise to facial nerve proper providing SVE to facial muscles)

Nervus intermedius (component of the facial nerve) which contains 3 components:
  • Superior salivary nucleus (parasympathetic GVE for secretomotor fibres)
  • Solitary nucleus (SVA fibers for taste)
What are the functions of cranial nerve VII (facial)? (5)
  • Motor to muscles of facial expression
  • Posterior belly of digastric muscle
  • Stylohyoid muscle
  • Secretomotor innervation to the salivary glands (except parotid) and lacrimal gland
  • Taste on anterior 2/3 of tongue
Describe the path that cranial nerve VII (facial) runs through
Runs in internal acoustic canal to the facial canal and exits at the stylomastoid foramen
What modality is cranial nerve VIII (vestibulocochlear)?
Mostly sensory
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