C14 - Cranial nerve X. Flashcards

1
Q

What is the name of cranial nerve X?

A

N. vagus

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2
Q

Type of nerve

A
  • Mixed nerve:
    • Motor fibers
    • Sensory fibers
    • Parasympathetic fibers
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3
Q

Where does the nerve arise from?

A
  • Motor fibers: arise in nucl. ambiguous of the medulla oblongata
  • Sensory neurons: ggl. proximale of n. vagus
  • Parasympathetic cell bodies: nucl. parasympatheticus of n. vagus

Nucleus:

  • Nucl. ambigus (somatomotor)
  • Nucl. spinalis n. trigemini (somatosensory)
  • Nucl. dorsalis n. vagi (visceromotor)
  • Nucl. alae cinerae (viscerosensory)
  • Nucl. tractus solitarii (special sensory)
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4
Q

Where does the nerve leave the skull?

A

For. jugulare

(continues as the cranial part of n. vagus)

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5
Q

Give the main divisions of the nerve

A
  • Cranial part
  • Cervical part
  • Thoracic part
  • Abdominal part
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6
Q

Cranial part

  1. Give the brancehs of the cranial part of n. vagus
  2. Draw the cranial portion
A
  1. R. auricularis (sensory)
  2. R. pharyngeus (sensory)
  3. R. laryngeus crnaialis
    1. ​External branch (motor)
    2. Internal branch (sensory)

Intracranial part:

  • From ggl. jugulare
    • ​R. meningeus
    • R. communicans cum IX
    • R. auricularis

Extracranial part:

  • From ggl. proximale:
    • ​Rr. pharyngei
      • ​Rr. dosalis
      • Rr. ventralis
    • N. laryngeus cranialis
  • From ggl. distale:
    • ​R. internus
    • R. externus
    • N. depressor
    • N. laryngeus recurens
      • ​N. laryngeus caudalis
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7
Q

Cervical part

Where does the cervical part of n. vagus begin?

A
  • After detachment of n. larygeus cranialis, from ggl. cervicale craniale and continues to ggl. cervicale mediale
  • Cervical part continues as a part of tr. vagosympatheticus
    • Runs with a. carotis communis
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8
Q

Thoracic part

Give the branches and its pathway in the thoracic cavity

A
  • The tr. vagosymatheticus splits at the thoracic inlet proximal to ggl. cervicale mediale
  • N. vagus continues to mediastineun and gives off:
    • Rr. cardiaca to cardiac plexus
    • N. laryngeus caudalis (aka n. recurens)
      • Innervates laryngeal muscels (motor) and caudal larynx (sensory)
  • The vagal trunk continues to the root of the lung, and divides into:
    • R. dorsalis
    • R. ventralis
  • They unite with their counterparts from the opposit side of the esophagus to form the dorsal and ventral vagal trunk
  • The dorsal and ventral vagal trunk pass through the hiatus esophageus of diaphragmN. vagus abdominalis
  • Plexus pericardius
  • Plexus pulmonalis
  • Plexus bronchalis
  • Plexus esophageus
  • Along esophageus:
    • N. vagus dexter/sinister:
      • ​Tr. vagalis dorsalis
      • Tr. vagalis ventralis
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9
Q

Abdominal part

A
  • At the abdominal cavity it spreads out to join the sympathetic fibers in the formation of the neural plexus responsible for the innervation of the visceral organs
  • Tr. vagalis dorsalis
    • ​Plexus coeliacus
    • Plexus mesentericus cranialis
  • Tr. vagalis ventralis (innervate: parietal surface of stomach, liver, pylorus)
  • Ggl. soleare (ggl. coeliacus + ggl. mesentericum graniale)
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10
Q

Draw n. vagus through the body

A
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11
Q

What do n. vagus innervate?

(ikke alt?)

A
  • Skin of external ear (sensory from r. auricularis)
  • Epiglottis, trachea, esophageus (sensory from r. pharyngeus)
  • Caudal pharyngeus constrictors (motor, from external branch of n. laryngeus cranialis)
  • Larynx (sensory from internal branch of n. laryngeus cranialis)
  • Viscera of thoracic and abdominal cavities
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