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PNS > CN X Part 2 > Flashcards

CN X Part 2 Flashcards

1
Q

What kind of fibers are carried by the branches to the carotid?

A

viscerosensory fibers

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2
Q

Where do the branches to the carotid carry info to and from?

A

from chemoreceptors in the carotid body to the inferior part of the nucleus for the solitary tract

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3
Q

Where is the superior laryngeal nerve given off?

A

just inferior to the inferior ganglion

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4
Q

What does the superior laryngeal nerve divide into?

A

internal and external laryngeal nerves

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5
Q

What kind of info is carried by the external laryngeal nerve and where?

A

motor info to the cricothyroid

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6
Q

What kind of info is carried by the internal laryngeal nerve and where?

A

sensory info from the laryngeal mucosa as far inferior as the vocal cords

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7
Q

Where is somatosensory info carried by the Vagus?

A

spinal nucleus of trigeminal

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8
Q

Where is viscerosensory info carried by the Vagus?

A

solitary nucleus

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9
Q

What nerve carries sensory info from below the vocal folds?

A

recurrent laryngeal

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10
Q

What muscle of the larynx does the recurrent laryngeal NOT supply?

A

cricothyroid (external laryngeal got this one)

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11
Q

What muscles ARE supplied by the recurrent laryngeal nerve and what are their actions?

A 
thyroarytenoid (shortens vocal cords by pulling arytenoid cartilages forward)
posterior cricoarytenoid (opens rima glottis)
lateral cricoarytenoid (closes rima glottis)
arytehnoid muscles (closes the rima glottis)
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12
Q

Other than motor info, what else is carried by the recurrent laryngeal nerve?

A

sensory info from the larynx inferior to the vocal cords

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13
Q

T/F: the recurrent laryngeal nerve follow the same path on both side.

A

False

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14
Q

which side of the recurrent laryngeal nerve is longer?

A

left side

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15
Q

Where does the recurrent laryngeal nerve come off of the vagus on the left side?

A

after the vagus passes in front of the aortic arch

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16
Q

After the recurrent laryngeal nerve comes off of the vagus nerve on the left side, where does it go?

A

passes under the aortic arch and ascends

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17
Q

What does the recurrent laryngeal nerve eventually become and what does it supply?

A

inferior laryngeal nerve which supplies the laryngeal musculature

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18
Q

What major vessel does the recurrent laryngeal nerve pass posterior to on the left?

A

aorta, specifically the aortic arch

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19
Q

What major vessel on the right does the recurrent laryngeal nerve pass posteriorly under before ascending similarly to the left?

A

subclavian artery

20
Q

Does the vagus descend anterior or posterior to the aorta and subclavian arteries?

A

anterior

21
Q

How many parasym contributers does the vagus supply to the cardiac plexus? sympathetic contributors/

A

2 parasym, 3 sym

22
Q

What kind of info is carried by the superior and inferior cervical cardiac branches to the cardiac plexus?

A

parasym

23
Q

What do the superior branches of the vagus nerve travel with to get to the cardiac plexus?

A

great vessels

24
Q

What gives off the inferior cervical cardiac branches and where do they travel?

A

recurrent laryngeal nerve; cardiac plexus

25
Q

One branch of the cervical cardiac branches carries viscerosensory info concerning the wall of the aorta. When is this nerve stimulated?

A

When aortic pressure is too high

26
Q

What is the cardiac paradox?

A

sympathetic supply dilates coronary arteries and parasympathetic constricts coronary arteries; Baroreceptors (parasym) cause vasodilation except in coronary arteries.

27
Q

Once the vagus nerve enters the thorax, what structure does it pass behind?

A

the root of the ipsilateral lung

28
Q

What plexus does the vagus nerve contribute to once it enters the thorax?

A

pulmonary plexus

29
Q

After contributing to the pulmonary plexus, what plexus does the vagus travel to and how does it get there?

A

the right vagus passes posteriorly and the left vagus passes anteriorly over the esophagus contributing to the esophageal plexus

30
Q

Which u\pulmonary plexus is larger?

A

posterior

31
Q

T/F: both pulmonary plexuses carry sympathetic info

A

true

32
Q

Where does the anterior pulmonary plexus receive sympathetic info from?

A

cervical sym ganglion

33
Q

Where does the posterior pulmonary plexus receive sympathetic info from?

A

2nd-5th or 6th thoracic ganglia

34
Q

Where does the right vagus nerve enter the abdominal cavity?

A

through the esophageal opening

35
Q

What does the right vagus nerve become once it enters the abdominal cavity?

A

posterior vagal trunk

36
Q

Where does the right vagus nerve terminate?

A

large celiac branch

37
Q

T/F: the right vagus sends branches to the anterior stomach after it becomes the posterior vagal trunk.

A

false; should say posterior stomach

38
Q

Where does the large celiac branch of the vagus nerve send branches? what organs are supplied by these?

A

celiac, superior mesenteric and renal plexuses; to the duodenum, liver, kidneys, small intestine and proximal 2/3 of the large intestine

39
Q

What anatomical structure correlates to the celiac branch of the vagus nerve (similarly to the arterial supply)

A

splenic/left colic flexure

40
Q

What does the left vagus nerve become once it enters the abdominal cavity?

A

anterior vagal trunk

41
Q

How does the left vagus nerve enter the abdominal cavity?

A

through the esophageal opening

42
Q

What organs are supplied by the anterior vagal trunk/left vagus nerve?

A

stomach, liver, pancreas and superior part of the duodenum

43
Q

What kind of info is carried by branches of the vagus nerve that are distributed via plexuses?

A

sympathetic and preganglionic parasym

44
Q

What would a bilateral dissection of the vagus nerve lead to?

A

death

45
Q

What would occur following a lesion of CN X within the cranial vault or close to the skull?

A

widespread problems: palatal, pharyngeal and laryngeal

46
Q

Damage to the recurrent laryngeal nerve would lead to what?

A

hoarseness or decreased volume of speech

PNS (43 decks)

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