Vagus Nerve and Laryngeal Function in Animals
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Questions and Answers

The optic nerve is CN I

False

List all twelve cranial nerves

Olfactory, optic, occulomotor, trochlear, trigeminal, abducens, facial, vestibulocochlear, glossopharyngeal, vagus, accessory and hypoglossal nerve

Select the cranial nerves that are Mixed nerves.

  • Trigeminal (correct)
  • Accessory
  • Vagus (correct)
  • Trochlear
  • What are all the mixed cranial nerves?

    <p>Trigeminal, Facial, Glossopharyngeal, and Vagus</p> Signup and view all the answers

    What are the cranial nerves that are associated with the PSNS?

    <p>Oculomotor, Facial, Glossopharyngeal and Vagus</p> Signup and view all the answers

    The vagus nerve exits the __________ as vagosympathetic trunk

    <p>The vagus nerve exits the tympano-occipital fissure as vasosympathetic trunk</p> Signup and view all the answers

    Which hole doe the ophthalmic nerve enter?

    <p>Orbital fissure</p> Signup and view all the answers

    The cricothyroideus m is innervated by the caudal laryngeal nerve

    <p>False</p> Signup and view all the answers

    The vagosympathetic trunk travels distally to become the _________

    <p>The vagosympathetic trunk travels dismally to become the L/R recurrent Laryngeal nerve.</p> Signup and view all the answers

    What nerve innervates the larynx?

    <p>Vagus</p> Signup and view all the answers

    Which muscle is specifically mentioned in relation to the effects of a damaged vagus nerve?

    <p>Cricoarytendoideus dorsal</p> Signup and view all the answers

    What consequence may occur if the recurrent laryngeal nerve is damaged?

    <p>Laryngeal hemiparalysis</p> Signup and view all the answers

    In which animal is laryngeal hemiparalysis referred to as 'roaring'?

    <p>Horses</p> Signup and view all the answers

    Which nerve passes through the cribiform plate?

    <p>Olfactory n.</p> Signup and view all the answers

    What nerve enters the optic foramen and passes through the optic canal?

    <p>Optic n.</p> Signup and view all the answers

    What three cranial nerves pass through the orbital fissure with the ophthalmic nerve?

    <p>Oculomotor, Trochlear and Abducens nerve</p> Signup and view all the answers

    What foramen does the buccal nerve arise from?

    <p>Oval foramen</p> Signup and view all the answers

    Which of the following nerves can be seen entering the mandibular foramen

    <p>Inferior alveolar n.</p> Signup and view all the answers

    The ophthalmic division of the trigeminal nerve contains _________ fibers.

    <p>The opthalmic division of the trigeminal nerve contains sensory fibers.</p> Signup and view all the answers

    What branches arise from the opthalmic division of the trigeminal nerve?

    <p>Nasociliary, frontal and lacrimal nerves.</p> Signup and view all the answers

    The maxillary division of the trigeminal nerve contains sensory and motor fibers.

    <p>False</p> Signup and view all the answers

    Describe the pathway the maxillary nerve travels in the skull.

    <p>The maxillary nerve courses through the round foramen, through the alar canal and Rostral alar foramen.</p> Signup and view all the answers

    What branches does the maxillary division of the trigeminal nerve give rise to?

    <p>Zygomatic branches, infraorbital nerve, and pterygopalatine nerve</p> Signup and view all the answers

    Parasympathetic postganglionic axons are long

    <p>False</p> Signup and view all the answers

    What nerves course through the orbital fissure?

    <p>CN IV</p> Signup and view all the answers

    Study Notes

    Vagus Nerve and Laryngeal Function

    • The vagus nerve, a cranial nerve, plays a crucial role in regulating various bodily functions, including the function of the larynx in dogs and other animals.
    • Damage to the vagus nerve can specifically affect the larynx, potentially leading to dysfunction.
    • One specific muscle affected by vagus nerve damage is the cricoarytenoideus dorsalis muscle.
    • The recurrent laryngeal nerve, a branch of the vagus nerve, innervates the cricoarytenoideus dorsalis muscle.
    • Damage to the recurrent laryngeal nerve results in laryngeal hemiparalysis, a condition where one side of the larynx is paralyzed.
    • Laryngeal hemiparalysis is known as "roaring" in horses, caused by the inability of the paralyzed side of the larynx to fully open during respiration.

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    Description

    Explore the critical role of the vagus nerve in laryngeal function, particularly in dogs and horses. Learn about the impact of damage to the recurrent laryngeal nerve and the resulting condition known as laryngeal hemiparalysis. Understand the anatomical relationships and implications for respiratory health.

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