VAGUS NERVE (X). N.vagus[X].Tenthcranialnerve (nerve of 4th and 5th pharyngeal arches). Together with the IX nerve, it exits the brain in the poserolateral sulcus and passes through the jugular foramen. Its supply region extends into the thoracic and abdominal cavities. A Superior (jugular) ganglion. Ganglion superius. Small superior sensory ganglion of vagus situated in the jugular foramen. A

Inferior (nodose) ganglion. Ganglion inferius. Large inferior, spindle-shaped ganglion of the vagus nerve. A

Meningeal branch. Ramus meningeus. Recurrent branch from the superior ganglion supplying the dura of the posterior cranial fossa in the region of the transverse and occipital sinuses. A Auricular branch. Ramus auricularis. Branch that arises from the superior ganglion of the vagus nerve, passes through the mastoid canal, exits through the tympanomastoid fissure and supplies the posterior surface of the pinna and the posterio-inferior wall of the external acoustic meatus. A Communicating branch with IX nerve. Ramus communicans[cum. n. glossopharyngeo]. Anastomotic branch from the auricular ramus to the glos-sopharyngeal nerve. A

Pharyngeal branch. Ramus pharyngealis (pharyngei). Branch radiating into the pharyngeal plexus. A

Pharyngeal plexus. Plexus pharyngealis. Nerve plexus below the middle pharyngeal constrictor formed by the glossopharyngeal and vagus nerves and the cervical sympathetic trunk. A Superior cervical cardiac branches. Rami cardi-aci cervicales superiores. Branches given off at variably high cervical levels; they travel to the deep part of the cardiac plexus. A Superior laryngeal nerve. N. laryngealis superior. Nerve that arises from the inferior ganglion and passes downward medial to the internal carotid artery to supply the larynx. A External branch of superior laryngeal nerve (external laryngeal nerve). Ramus externus. Nerve that branches to the inferior pharyngeal constrictor and then, covered by the infrahyoid musculature, passes to the cricothyroid muscle. A

Internal branch (internal laryngeal nerve).

Ramus internus. Together with the superior laryngeal artery, it penetrates the thyrohyoid membrane and emerges below the mucosa of the piriform recess. It supplies the mucosae of the epiglottic valleculae, the epiglottis and the larynx as far down as the level of the vocal folds. A

Branch communicating with the recurrent laryngeal nerve. Ramus communicans [cum. n. laryngeali recurrenti]. A

Inferior cervical cardiac branches. Rami cardiaci cervicales inferiores. On the right, they pass to the deep part of the cardiac plexus; on the left, they pass to the superficial part of the cardiac plexus accompanied by the vagus nerve. A

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