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Neurology

Chapter 10. Disorders of Swallowing and Phonation. Glossopharyngeal and Vagus Nerve Lesions

3 topics with a brief review: definitions, key facts, and class questions.

Swallowing and phonation are complex reflex acts mediated by the close interaction of the glossopharyngeal (CN IX) and vagus (X) nerves. In this chapter, we analyze the anatomy of their nuclei, neural pathways, and the clinical presentation of their lesions.

This section includes a detailed breakdown of two key pathological complexes: bulbar and pseudobulbar syndromes. You will learn why one pathology causes tongue atrophy and fasciculations, while the other leads to oral reflex automatisms, forced laughter, and crying.

In practical classes and exams, the differential diagnosis of bulbar and pseudobulbar syndromes is a absolute classic. Instructors are sure to ask you about the lesion localization (brainstem or bilateral damage to the corticobulbar tracts) and ask you to demonstrate the examination of the gag and palatal reflexes. The material in this chapter will help you organize this knowledge systematically.

Section Topics

Glossopharyngeal and vagus nervesNervus glossopharyngeus et nervus vagusBulbar and pseudobulbar syndromesBulbar and pseudobulbar syndromes combine disorders of swallowing, Vertebral artery syndromeIn modern neurology, blood flow disorders in the vertebral artery bas

Frequently asked questions for this section

Why does the swallowing reflex not disappear in unilateral cerebral cortex lesions?

The motor nucleus ambiguus, which innervates the pharyngeal muscles, receives bilateral cortical innervation. Impulses from the healthy hemisphere fully compensate for the function.

What is the main pathogenetic difference between bulbar and pseudobulbar palsies?

Bulbar palsy is a lower motor neuron (peripheral) paralysis occurring when the medulla oblongata nuclei themselves are damaged. Pseudobulbar palsy is an upper motor neuron (central) paralysis that develops due to bilateral damage to the corticobulbar tracts projecting to these nuclei.

Can the vertebral artery be compressed during sleep and cause a stroke?

No, the theory that ischemia occurs due to kinking of the vertebral artery during sleep has not been confirmed. The true causes lie in embolism, atherothrombosis, or vascular dissection.

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