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The vagus nerve (/ ˈ v eɪ. ɡ ə s /), also known as the tenth cranial nerve, cranial nerve X, or simply CN X, is a cranial nerve that carries sensory and motor fibers. It creates a pathway that interfaces with the parasympathetic control of the heart, lungs, and digestive tract. [1]
Controls the sternocleidomastoid and trapezius muscles, and overlaps with functions of the vagus nerve (CN X). Symptoms of damage: inability to shrug, weak head movement. XII Hypoglossal: Mainly motor Medulla: Located in the hypoglossal canal.
These lesions typically damage the cranial nerves leading to both motor and sensory deficits. The cranial nerves that are impaired include the following; Cranial Nerve (CN) V (the trigeminal nerve), CN VII (the facial nerve), CN IX (the glossopharyngeal nerve), CN X (the vagus nerve), and CN XII (the hypoglossal nerve).
The vagus nerves run down into the thorax, and the recurrent laryngeal nerves run up to the larynx. [3]: 930–931 The vagus nerves, from which the recurrent laryngeal nerves branch, exit the skull at the jugular foramen and travel within the carotid sheath alongside the carotid arteries through the neck.
Bulbar palsy involves problems with function of the glossopharyngeal nerve (CN IX), the vagus nerve (CN X), the accessory nerve (CN XI), and the hypoglossal nerve (CN XII). [1] These all emerge from pathways in the medulla oblongata. [1] A lower motor neuron lesion can impair their function. [5] [1]
Irritation of the internal laryngeal nerve results in uncontrolled coughing - usually as a result of food or water in the laryngopharynx. The lesion of this branch (for example, during surgery) that seeks an anterior approach to the cervix, is associated with a loss of the laryngeal reflex of cough and an elevated risk of aspiration pneumonia. [7]
Neurological injury due to damage in the central or peripheral nervous system may result in weakness, paralysis, or a lack of coordination of the motor–speech system, producing dysarthria. [1] These effects in turn hinder control over the tongue, throat, lips or lungs; for example, swallowing problems ( dysphagia ) are also often present in ...
Nucleus ambiguus - (which affects vagus nerve and glossopharyngeal nerve) - localizing lesion (all other deficits are present in lateral pontine syndrome as well) Ipsilateral laryngeal, pharyngeal, and palatal hemiparalysis: dysphagia, hoarseness, absent gag reflex (efferent limb—CN X) Descending sympathetic fibers
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