CRANIAL NERVES & INNERVATION

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CRANIAL NERVE I

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CRANIAL NERVE I

olfactory nerve

  • sense of smell

  • sensory

  • VA

  • bipolar neurons

<p>olfactory nerve</p><ul><li><p>sense of smell</p></li><li><p>sensory</p></li><li><p>VA</p></li><li><p>bipolar neurons</p></li></ul>
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CRANIAL NERVE II

optic nerve

  • sense of vision

  • sensory

  • SA

  • bipolar neurons

<p>optic nerve</p><ul><li><p>sense of vision</p></li><li><p>sensory</p></li><li><p>SA</p></li><li><p>bipolar neurons</p></li></ul>
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CRANIAL NERVE III

oculomotor nerve

  • innervates superior rectus, inferior rectus, medial rectus, and inferior oblique

  • motor

  • SE and VE

  • multipolar neurons

<p>oculomotor nerve</p><ul><li><p>innervates superior rectus, inferior rectus, medial rectus, and inferior oblique</p></li><li><p>motor</p></li><li><p>SE and VE</p></li><li><p>multipolar neurons</p></li></ul>
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CRANIAL NERVE IV

trochlear nerve

  • eye movement

  • innervates superior oblique

  • motor

  • SE

  • multipolar

<p>trochlear nerve</p><ul><li><p>eye movement</p></li><li><p>innervates superior oblique</p></li><li><p>motor</p></li><li><p>SE</p></li><li><p>multipolar</p></li></ul>
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CRANIAL NERVE V

trigeminal nerve

  • facial sensation, muscles of mastication

  • BOTH

  • SE and SA

  • multipolar and pseudo unipolar

<p>trigeminal nerve</p><ul><li><p>facial sensation, muscles of mastication</p></li><li><p>BOTH</p></li><li><p>SE and SA</p></li><li><p>multipolar and pseudo unipolar</p></li></ul>
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CRANIAL NERVE VI

abducens nerve

  • innervates lateral rectus muscle, which abducts eye

  • motor

  • SE

  • multipolar

<p>abducens nerve</p><ul><li><p>innervates lateral rectus muscle, which abducts eye</p></li><li><p>motor</p></li><li><p>SE</p></li><li><p>multipolar</p></li></ul>
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CRANIAL NERVE VII

facial nerve

  • facial expression, taste, secretions of salivary and lacrimal glands

  • BOTH

  • SE, VE, SA, VA

  • multipolar and pseudounipolar

<p>facial nerve</p><ul><li><p>facial expression, taste, secretions of salivary and lacrimal glands</p></li><li><p>BOTH</p></li><li><p>SE, VE, SA, VA</p></li><li><p>multipolar and pseudounipolar</p></li></ul>
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CRANIAL NERVE VIII

vestibulocochlear nerve

  • hearing and equilibrium

  • sensory

  • SA

  • bipolar

<p>vestibulocochlear nerve</p><ul><li><p>hearing and equilibrium</p></li><li><p>sensory</p></li><li><p>SA</p></li><li><p>bipolar</p></li></ul>
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CRANIAL NERVE IX

Glossopharyngeal Nerve

  • gag reflex, pharyngeal muscles

  • BOTH

  • SE, VE, SA, VA

  • multipolar and pseudounipolar

<p>Glossopharyngeal Nerve</p><ul><li><p>gag reflex, pharyngeal muscles</p></li><li><p>BOTH</p></li><li><p>SE, VE, SA, VA</p></li><li><p>multipolar and pseudounipolar</p></li></ul>
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10

CRANIAL NERVE X

Vagus nerve

  • laryngeal muscles (voice), pharyngeal muscles (swallowing)

  • BOTH

  • SE, VE, SA, VA

  • multipolar and pseudounipolar

<p>Vagus nerve</p><ul><li><p>laryngeal muscles (voice), pharyngeal muscles (swallowing)</p></li><li><p>BOTH</p></li><li><p>SE, VE, SA, VA</p></li><li><p>multipolar and pseudounipolar</p></li></ul>
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CRANIAL NERVE XI

spinal accessory nerve

  • head-turning

  • motor

  • SE

  • multipolar

<p>spinal accessory nerve</p><ul><li><p>head-turning</p></li><li><p>motor</p></li><li><p>SE</p></li><li><p>multipolar</p></li></ul>
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CRANIAL NERVE XII

Hypoglossal nerve

  • tongue movement

  • motor

  • SE

  • multipolar

<p>Hypoglossal nerve</p><ul><li><p>tongue movement</p></li><li><p>motor</p></li><li><p>SE</p></li><li><p>multipolar</p></li></ul>
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13

somatic efferent nerves

innervate skeletal muscle

  • CN 3, 4, 5, 6, 7, 9, 10, 11, 12

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somatic afferent

sensations of vision, tactile and pain, hearing and equilibrium

  • CN 2, 5, 7, 8, 9, 10

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15

visceral efferent

innervation of smooth muscle, cardiac muscle, and glands

  • CN 3, 7, 9, 10

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visceral afferent

sensations from viscera including olfaction and taste

  • CN 1, 7, 9, 10

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which cranial nerves have bipolar neurons?

CN I, II, VIII

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18

which cranial nerves has pseudounipolar neurons?

CN V, VII, IX, X

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19

lesion of oculomotor nerve (III)

  • eye deviation inferiorly and laterally (lateral strabismus)

  • eyelid droops (ptosis)

  • pupil dilates (mydriasis)

  • pupillary light reflex lost

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20

Lesion of trochlear nerve (IV)

eye deviates superiorly and laterally

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lesion of abducens nerve (VI)

eye deviates medially (medial strabismus)

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22

lesion of spinal accessory nerve (XI)

  • difficulty shrugging ipsilateral shoulder

  • difficulty turning head in contralateral direction

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lesion of hypoglossal nerve (XII)

  • tongue deviates ipsilaterally when protruded

  • slurred speech (dysarthria)

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lesion of olfactory nerve (I)

loss of smell (anosmia)

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25

lesion of optic nerve (II)

ipsilateral blindness (anopsia)

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Lesion of vestibulocochlear nerve (VIII)

  • ipsilateral deafness

  • loss of equilibrium

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lesion of trigeminal nerve (V)

  • ipsilateral loss of tactile and pain for forehead and midface (V1 and V2)

  • jaw deviates ipsilaterally when opened (V3)

  • ipsilateral loss of tactile and pain for lower face (including anterior 2/3 tongue)

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28

lesion of facial nerve (VII)

  • ipsilateral paralysis of muscles of facial expression (Bell's palsy)

  • ipsilateral loss of lacrimation and salivation

  • ipsilateral loss of taste from anterior 2/3 of tongue

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29

lesion of glossopharyngeal nerve (IX)

  • ipsilateral loss of taste from posterior 1/3 of tongue

  • loss of gag reflex (sensory limb)

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30

lesion of vagus nerve (X)

  • uvula deviates contralaterally

  • loss of gag reflex (motor limb)

  • dysarthria

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