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Vagus nerve (commonly known as the pneumogastric nerve) is a cranial nerve that is connected to the heart and the digestive tract. The nerve is the tenth nerve in the cranium is one of the most important nerves associated with speech. The term "vagus" is taken from Latin and it means "wandering." The nerve got its name as a consequence of the fact that it appears to wander from its initial location in the brain stem to the splenic fixture in the colon.
It's emerging from the brainstem at the medulla, below the glossopharyngeal and accessory nerves. The nerve is similar to several rootlets which come together in two roots exiting the cranium by going through the jugular foramen. "Its two sensory ganglia, the superior (jugular) and inferior (nodosum), are located on the nerve within the jugular fossa of the petrous temporal bone, which, together with the occipital bone, forms the jugular foramen." (Langmore, 27)
The vagus nerve is particularly long and its several branches serve a series of body parts such as the heart, larynx, and velum. Motor speech production is associated with three branches of this nerve:
The pharyngeal branch
The external superior laryngeal nerve branch
The recurrent nerve branch
The vagus nerve is responsible...
When considering its location in the neck, the vagus nerve can be identified by looking at the point between the internal jugular vein and the internal carotid artery. The nerve then goes down straight through the carotid sheet.
The vagus nerve triggers autonomic innervation to glands in the pharyngeal mucosa. The nerve also provides motor innervation, as it goes through the pharyngeal plexus and reaches all the muscles in the velopharynx and pharynx, with the only muscle that it does not reach being the stylopharyngeal muscle.
The gag reflex is often associated with the vagus nerve: by stimulating the faucial pillars or the walls in pharynx through touch, the nerve reaches palatal elevation. "The afferent limb of the gag reflex is the glossopharyngeal nerve; the efferent limb is the vagus nerve." (Langmore, 27)
By damaging the pharyngeal branch of the vagus nerve, one can seriously damage the movement of the velum. Unilateral damage to the branch can cause the velum to be lower in the part that is affected when compared to the part that is intact.
Works cited:
Freed, D.B. "Motor Speech Disorders: Diagnosis and Treatment,…
Works cited:
Freed, D.B. "Motor Speech Disorders: Diagnosis and Treatment, Volume 1," (Cengage Learning, 2000)
Langmore, S.E. "Endoscopic Evaluation and Treatment of Swallowing Disorders," (Thieme, 2001)
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