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1 vessels and nerves > vagus and phrenic nerves > Flashcards

vagus and phrenic nerves Flashcards

1
Q

describe the pathway of the vagus nerve in the HEAD

A
  • originates in brainstem
  • exits cranium via jugular foreamen
  • auricular branch
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2
Q

describe the pathway of the vagus nerve in the NECK

A
  • travels inferiorly in the carotid sheath (w/common carotid and internal jugular )
  • has several branches in neck
  • divides into L&R at base of neck
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3
Q

what are the branches of the vagus nerve that arise in the neck?

A
  1. pharyngeal branch
  2. superior laryngeal
  3. recurrent laryngeal
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4
Q

what does the pharyngeal branch of the vagus nerve supply?

A

motor to pharynx constrictor muscles

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5
Q

what does the superior laryngeal branch of the vagus nerve supply?

A

internal branch - motor to cricothyroid

external branch - viscera sensory to laryngopharynx and superior pharynx

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6
Q

what does the recurrent laryngeal branch of the vagus nerve supply?

A

only on right

- motor to intrinsic muscles of the larynx

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7
Q

what does the auricular branch of the vagus nerve supply?

A

somatic sensory for the external accoustic meatus

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8
Q

how does the left vagus nerve travel from the neck to the thorax?

A
  • inferior to common carotid & subclavian
  • posterior to sternoclavicular joint
  • enters thorax
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9
Q

how does the right vagus nerve travel from the neck to the thorax?

A
  • anterior to subclavian
  • posterior to sternoclavicular joint
  • enters thorax
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10
Q

what are the vagal branches in the thorax?

A
  1. the posterior (R) and anterior (L) vagal trunks
  2. the left recurrent laryngeal
  3. the cardiac branches
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11
Q

what do the thoracic vagal trunks of the vagus nerve supply?

A
  • supply to oesophageal plexus
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12
Q

what does the left recurrent laryngeal branch of the vagus nerve supply?

A
  • intrinsic muscles of the larynx
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13
Q

what do the cardiac branches of the vagus nerve supply?

A
  • visceral sensation of the heart

- parasympathetic regulation of heart rate

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14
Q

how do the L&R vagal nerves enter the abdomen?

A
  • go through the oesophageal hiatus in diaphragm
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15
Q

what doe the terminating vagus branches in the abdomen supply?

A

parasympathetic innervation of the GI system
- contracts smooth muscle
- glandular secretions
(oesophagus, stomach, bowels)

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16
Q

what is the special sensory function of the vagus?

A
  • taste (minor role)
17
Q

OVERVIEW: what are the sensory functions of the vagus?

A

somatic
1. external acoustic meatus

viscera

  1. laryngopharynx
  2. superior larynx
  3. heart
  4. GI tract
18
Q

OVERVIEW: what are the motor functions of the vagus?

A
  • constrictor muscles of pharynx
  • intrinsic muscles of larynx
  • soft palate
19
Q

OVERVIEW: what are the parasympathetic functions of the vagus?

A
  • regulates heart rate

- contractions and secretions in GI tract

20
Q

where does the phrenic nerve originate for?

A

C3,4,5

lateral border of anterior scalene muscle (on L&R side)

21
Q

at what point does the course of the L&R phrenic nerves start to differ?

A

at subclavian vein

22
Q

describe the anatomical route of the right phrenic vein from subclavian vein to diaphragm

A
  1. passes over right subclavian artery laterally
  2. enters thorax via superior thoracic arpeture
  3. descends ant.along right lung root
  4. along RA pericardium
  5. pierces diaphragm at IVC opening
23
Q

describe the anatomical route of the left phrenic vein from subclavian vein to diaphragm

A
  1. passes over right subclavian artery medially
  2. enters thorax via superior thoracic arpeture
  3. descends ant.along left lung root
  4. along LV pericardium
  5. pierces diaphragm on inferior surface
24
Q

motor function of phrenic?

A

innervates diaphragm

25
Q

sensory function of phrenic?

A

peritoneum and pleura of the diaphragm

pericardium and pleura of the mediastinum

1 vessels and nerves (2 decks)

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