8 CN IX, X, XI, XII Flashcards

1
Q

CN XII (Hypoglossal)

  1. Axon:
  2. Origin:
  3. Peripheral termination:
A
  1. GSE
  2. Hypoglossal nucleus
  3. Tongue muscles
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2
Q

Tongue protrusion muscle

A

Genioglossus muscle

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3
Q

Hypoglossal nerve (LMN) lesion causes:

A
  1. Tongue deviation toward lesion
  2. Fasciculation
  3. Atrophy
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4
Q

UMN (Corticobulbar) injury of tongue causes:

A
  1. Tongue deviation toward side opposite UMN lesion
  2. No fasciculations
  3. Minimal atrophy
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5
Q

CN XI (Accessory)

  1. Axon
  2. CNS origin
  3. Peripheral termination
A
  1. SVE
  2. Accessory nucleus in cervical spinal cord (caudal medulla-C5)
  3. Sternocleidomastoid, trapezius
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6
Q

CN IX (Glossopharyngeal)

  1. Axon
  2. CNS origin/termination
  3. Peripheral origin/termination
A
  1. SSA
  2. Solitary tract nucleus
  3. Taste buds posterior 1/3 tongue
  4. GVA
  5. Solitary tract nucleus
  6. Carotid body and sinus
  7. GSA
  8. Spinal trigeminal nucleus
  9. Mucosa posterior 1/3 tongue, pharynx, middle ear, skin of outer ear
  10. GVE
  11. Inferior salivatory nucleus
  12. Parotid gland
  13. SVE
  14. Nucleus ambiguus
  15. Pharynx (stylopharyngeus)
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7
Q

Sudden burst of pain starts in posterior tongue or wall of pharynx, then radiates to ear. Trigger zone in this and attacks precipitated by swallowing/talking.

A

Glossopharyngeal Neuralgia

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8
Q

CN X (Vagus)

  1. Axon
  2. CNS origin/termination
  3. Peripheral origin/termination
A
  1. GSA
  2. Spinal trigeminal nucleus
  3. Skin of outer ear
  4. SVA
  5. Solitary tract nucleus
  6. Taste buds: epiglottis/esophagus
  7. GVA
  8. Solitary tract nucleus
  9. Thoracic/abdominal viscera; larynx/pharynx mucosa; aortic arch stretch receptors; aortic bodie chemoreceptors
  10. GVE
  11. Dorsal motor nucleus
  12. Thoracic/abdominal viscera: smooth muscle and glands
  13. SVE
  14. Nucleus ambiguus
  15. Larynx/pharynx
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9
Q

Gag reflex (touch one side of pharynx, elicit bilateral response):
Afferent component CN __
Efferent component CN __

A

IX

X

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10
Q

Tongue thrust reflex (infants-8 years possible)
Afferent limb CN ___
Efferent limb CN ___

A

V or IX

XII

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11
Q

The hypoglossal nucleus is located in this section of the brainstem:

A

Rostral medulla (medial posterior)

CN IX and X structures are also located on the Rostral Medulla

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