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Veterinary Anatomy III > THRC.14 > Flashcards

THRC.14 Flashcards

1
Q

CN-X

A

Vagus nerve

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2
Q

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

A

True

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3
Q

Which classes of fibre are present in vagus?

A
  • Sensory
  • Motor
  • Parasympathetic
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4
Q

Motor fibres of vagus arise from…

A

Nucleus ambiguus

(In the medulla oblongata)

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5
Q

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

A

Acessory nerve

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6
Q

The proximal ganglion of vagus nerve is composed of…

A

Cell bodies of pseudounipolar sensory neurons

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7
Q
A

Pharyngeal branch

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8
Q
A

Cranial laryngeal nerve

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9
Q
A

Vagosympathetic trunk

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10
Q

The pharyngeal branch from the vagus nerve goes to form…

A

The pharyngeal plexus

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11
Q

Function of the pharyngeal plexus

A

Sensory:

  • Epiglottis
  • Trachea
  • Oesophagus

Motor:

  • Constrictors of pharynx
  • Root of the tongue
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12
Q

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

A

At the distal ganglion

(Marking the end of the cranial portion of vagus)

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13
Q

What is the fate of the cranial laryngeal nerve?

A
  • Depressor branch
  • Split:
    • Internal branch → Larynx (Sensory)
    • External branch → Pharyngeal constrictors (Motor)
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14
Q

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

A

At the thoracic inlet

(Proximal to the middle cervical ganglion)

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15
Q

Where in the mediastinum does vagus split?

A

At the point of the heart

Detaching:

  • Cardiac branches
  • Lung branches:
    • Dorsal branch
    • Ventral branch
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16
Q

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

A
  • Left: Arches around the aorta
  • Right: Right subclavian artery
17
Q

The function of the caudal/recurrent? laryngeal nerves

A
  • Motor:
    • All muscles of the larynx (excl. cricothyroid)
  • Sensory:
    • Caudal part of larynx
18
Q

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

A
  • Unite with the dorsal and ventral branches of the opposite side
  • Forming dorsal and ventral vagal trunks
19
Q

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

A

Via hiatus oesophagus

20
Q

The fate of the abdominal vagus nerve

A
  • Spreads to join the sympathetic fibres
  • Innervating the visceral organs
21
Q
A

Right + left cranial cervical ganglionn

22
Q
A

Right + left cranial laryngeal nerve

23
Q
A

Left vagus nerve

24
Q
A

Right + left recurrent laryngeal nerve

25
Q
A

Right subclavian artery

26
Q
A

Ansa subclavia

27
Q
A

Right + left vagus nerve

28
Q
A

Left recurrent laryngeal nerve

Veterinary Anatomy III (124 decks)

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