THRC.14

Question 1

CN-X

Answer 1

Vagus nerve

Question 2

Vagus is the largest parasympathetic nerve of the autonomous nervous system, true or false?

Answer 2

True

Question 3

Which classes of fibre are present in vagus?

Answer 3

• Sensory
• Motor
• Parasympathetic

Question 4

Motor fibres of vagus arise from…

Answer 4

Nucleus ambiguus

(In the medulla oblongata)

Question 5

Vagus motor fibres are joined by motor fibres from which other nerve?

Answer 5

Acessory nerve

Question 6

The proximal ganglion of vagus nerve is composed of…

Answer 6

Cell bodies of pseudounipolar sensory neurons

Question 7

Answer 7

Pharyngeal branch

Question 8

Answer 8

Cranial laryngeal nerve

Question 9

Answer 9

Vagosympathetic trunk

Question 10

The pharyngeal branch from the vagus nerve goes to form…

Answer 10

The pharyngeal plexus

Question 11

Function of the pharyngeal plexus

Answer 11

Sensory:

• Epiglottis
• Trachea
• Oesophagus

Motor:

• Constrictors of pharynx
• Root of the tongue

Question 12

At what point does the cranial laryngeal nerve arise from the vagus nerve?

Answer 12

At the distal ganglion

(Marking the end of the cranial portion of vagus)

Question 13

What is the fate of the cranial laryngeal nerve?

Answer 13

• Depressor branch
• Split:
  
  • Internal branch → Larynx (Sensory)
  • External branch → Pharyngeal constrictors (Motor)

Question 14

At what point does the vagus nerve separate from the vagosympathetic trunk?

Answer 14

At the thoracic inlet

(Proximal to the middle cervical ganglion)

Question 15

Where in the mediastinum does vagus split?

Answer 15

At the point of the heart

Detaching:

• Cardiac branches
• Lung branches:
  
  • Dorsal branch
  • Ventral branch

Question 16

At what point do the left and right recurrent laryngeal nerves loop back to the larynx?

Answer 16

• Left: Arches around the aorta
• Right: Right subclavian artery

Question 17

The function of the caudal/recurrent? laryngeal nerves

Answer 17

• Motor:
  
  • All muscles of the larynx (excl. cricothyroid)
• Sensory:
  
  • Caudal part of larynx

Question 18

The fate of the vagus dorsal and ventral branches in the mediastinum

Answer 18

• Unite with the dorsal and ventral branches of the opposite side
• Forming dorsal and ventral vagal trunks

Question 19

Where do the dorsal and ventral vagus trunks pass into the abdomen?

Answer 19

Via hiatus oesophagus

Question 20

The fate of the abdominal vagus nerve

Answer 20

• Spreads to join the sympathetic fibres
• Innervating the visceral organs

Question 21

Answer 21

Right + left cranial cervical ganglionn

Question 22

Answer 22

Right + left cranial laryngeal nerve

Question 23

Answer 23

Left vagus nerve

Question 24

Answer 24

Right + left recurrent laryngeal nerve

Question 25

Answer 25

Right subclavian artery

Question 26

Answer 26

Ansa subclavia

Question 27

Answer 27

Right + left vagus nerve

Question 28

Answer 28

Left recurrent laryngeal nerve