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cranial nerves > Vagus nerve > Flashcards

Vagus nerve Flashcards

1
Q

nuclie’s of the vagus nerve

A
  • ambiguous nucleus
  • medial ala cinerea nucleus
  • solitary tract nucleus
  • lateral ala cinerea nucleus
  • spinal trigeminal nucleus
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2
Q

location and function of ambiguous nucleus

A
  • medulla

- SVM

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3
Q

location and function of medial ala cinerea nucleus

A
  • medulla long nucleus lying vertically upper lies in vagal triangle, lower end lies in central grey matter of medulla
  • parasymp. preggl fibers GVM
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4
Q

location and function of solitary tract nucleus

A
  • medulla

- tast SVS *commissural nucleus plays a role in heart rate and blood pressure regulation

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5
Q

location and function of lateral ala cinerea nucleus

A
  • part of solitary tract in cranial open part of medulla

- GVS

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6
Q

location and function of spinal trigeminal nucleus

A
  • extends down principal nucleus into medulla until c1-c2 segments of spinal cord
  • protopathic sensibility GSS
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7
Q

Brain exit of Vagus nerve

A

lateral paraolivary sulcus

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8
Q

dura pentration of Vagus nerve

A

jugular foramen pars nervosa

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9
Q

skull exit of Vagus nerve

A

jugular foramen pars nervosa

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10
Q

ganglia of Vagus nerve

A
  • superior jugular ggl

- inferior nodose ggl

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11
Q

superior (jugular) ggl

A

small sensory ggl on vagus as it traverses the jugular foramen
-cell bodies are for protopathic sensibility of dura and external ears terminal in spinal trigeminal nucleus

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12
Q

inferior (nodose) ggl

A

large sensory ggl of vagus, ant to the internal jugular vein

-cell bodies are for taste sensation and for viscerosensory sensation

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13
Q

where do the vagus nerve go?

A

both right and left vagus nerve decend from the brain in the carotid sheath lateral to the carotid artery, enter the thoracic cavity through the thoracic inlet

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14
Q

right vagus nerve

A

-gives rise to right recurrent laryngeal nerve
-hooks around right subclavian artery ascends into next between trachea and esophagus
-cosses ant. to the right subclavian artery and runs post. to the sup vena cava and descends post. to the right main bronchus an contributes to
*cardiac
*pulmonary
*esophageal
plexuses.
-forms the post vagal trunk at lower part of the esophagus and enters the diaphragm through the esophageal hiatus

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15
Q

left vagus nerve

A

enter thorax between left common carotid artery and left subclavian artery and descends on the aortic arch

  • gives rise to left recurrent laryngeal nerve which hooks around the aortic arch to the left ligamentum arteriosum
  • ascends between the trachea and esophagus
  • continues into the esophageal plexus and enters the abdomen as the anterior vagal trunk in the esophageal hiatus of the diaphragm
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16
Q

branches of the vagus nerve

A
  • meningeal branch
  • arnolds nerve
  • pharyngeal branches
  • superior laryngeal nerve
  • recurrent laryngeal nerves
  • cardiac branches
  • esophageal branches
  • pulmonary branches
  • anterior and posterior vagal trunks
17
Q

meningeal branch

A

inn of the post. part of dura matter

18
Q

auricular branch of vagus nerve (arnold’s nerve)

A

from sup. ggl inn 1/3 of the tympanic membrane and external acoustic meatus and the pannus of the auricle + small dorsal part

19
Q

pharyngeal branches

A

combines in the pharynx with the pharyngeal branches of glossopharyngeal nerve to form the pharyngeal nerve plexus which is a mix motor/ sensory plexus

20
Q

pharyngeal nerve plexus

A
  • sensory inn of the mucosa of lower pharynx and epiglottis
  • taste sensation of accessory taste buds on epiglottis
  • motor branches for soft palate and pharyngeal muscles:
  • lower 1/2 of middle constrictor of pharynx
  • inferior constrictor of pharynx
  • palatopharyngeus muscle
  • salpingopharyngues muscle
  • palatoglossus muscle
  • leavtor veli palatini muscle
21
Q

superior laryngeal nerve

A
  • branch of vagus n. at inferior ggl
  • at thryoid cartilage it divides into two branches
  • internal laryngeal nerve
  • external laryngeal nerve
22
Q

internal laryngeal nerve

A

sensory branch that supplies the mucous membrane of larynx superior to the vocal folds
*sensory + parasympathetic

23
Q

external laryngeal nerve

A

motor branch that supplies the cricothyroid muscle

24
Q

recurrent laryngeal nerves

A

has:

  • tracheal branches
  • esophageal branches
  • inferior laryngeal nerve
25
Q

tracheal branches

A

parasympathetic, sensory & motor innervation of the mucosa and smooth muscle of trachea

26
Q

esophageal branches

A

parasymp, sensory and motor innervation of the upper esophagus

27
Q

inferior laryngeal nerve

A

terminal branch of the recurrent laryngeal nerve as the latter passes deep to the inferior pharyngela constrictor to supply

  • laryngeal mucosa
  • inferior vocal folds
  • all the laryngeal muscles EXCEPT the cricothyroid muscle
28
Q

cardiac branches

A

conducts presynaptic parasymp fibers to and relex afferent fibers from the cardiac plexus

29
Q

cardiac plexus

A
  • superior cervical cardiac branch
  • inferior cervical cardiac branch
  • thoracic cardiac branches
30
Q

esophageal branches

A

includes both branches passing directly from vagi and the branches from the recurrent laryngeal nerves that form the esphageal nerve plexus which surrounds esophagus, supplying it and adjacent portions of the pericardium

31
Q

pulmonary branches

A

bronchial branches of the vagus nerve at the hilium, from them various branches accompany the bronchi and arteries into the the lung

32
Q

anterior and posterior vagal trunks

A

ant. mainly from left vagus and post from the right as the stomach rotates, they supply parasymp., secretomotor, afferent fibers for the entire GI tract untill the left colic flexure.

33
Q

supply of the anterior and posterior vagal trunks

A
  • gastric branches (ant & post) (stomach)
  • celiac branches (celiac plexus around the trunk)
  • heaptic, pyloric and gall bladder branches(hepatic plexus)
  • vagal fibers for small and large intestines up to the left coic flexure accompanying the mesenteric arteries

cranial nerves (11 decks)

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