Glossopharyngeal nerve

Glossopharyngeal nerve (nervus glossopharyngeus) - IX pair of cranial nerves. Is a mixed nerve: contains sensory, motor and parasympathetic fibers (Fig.). Sensory fibers of the glossopharyngeal nerve originates from two sites: the upper (ganglion superius), located on top of the jugular foramen, and lower (ganglion inferius), lying in rocky hole on the bottom of the pyramid of the temporal bone.

the topography of the glossopharyngeal nerve
Topography n. glossopharyngeus:

1 - n. hypoglossus;
2 - n. lingualis;
3 - n. glossopharyngeus;
4 - chorda tympani;
5 - n. facialis.

Afferent fibers taste sensitivity begin in cells bottom of the site. Peripheral their branches are directed to taste papilla posterior thirds of the tongue; Central branch (axons cells node) in the root of the glossopharyngeal nerve included in the medulla, which in solitary beam (tractus solitarius) and end at its nuclei.
Afferent fibers that are relevant to the overall sensitivity begin in cells of both nodes. Peripheral processes of the cells of these nodes branch in posterior third of the tongue, in the amygdala, on the upper surface of the epiglottis, in the throat, in the auditory tube in the tympanic cavity, and also give a branch to the carotid sinus (r. sinus carotici). Axons of these cells are in the medulla and with taste are solitary beam. Motor nucleus of the glossopharyngeal nerve are the front departments dual core (nucleus ambiguus). Glossopharyngeal nerve together with the vagus nerve exits through the jugular opening of the skull, then goes between the internal jugular vein and carotid artery forth between the two carotid arteries in xiloglucanes muscle and bended forward and upward, suited to the language used here is divided into the target branch (rr. linguales). Motor branch take part in the innervation of muscles of the pharynx (ramus m. stylopharyngei). In addition to the motor and sensory fibers, glossopharyngeal nerve contains parasympathetic secretory fiber for the parotid gland. Lower sljunootdelitelnoe nucleus salivatorius inferior) lies in the medulla. Fibers from the kernel go to the glossopharyngeal nerve, then enter the drum nerve (n. tympanicus) and in the small rocky nerve (n. petrosus minor) go to the ear site (ganglion oticum), and then from this site are sent to the parotid gland.
The glossopharyngeal nerve disease can be caused by different processes in the posterior cranial fossa (meningitis, tumors, hemorrhage, and intoxication). The defeat of the glossopharyngeal nerve disorder is manifested in the taste on the posterior third of the tongue, in violation of the sensitivity of the upper half of the larynx, in a swallowing disorder due to a partial paralysis of the muscles of the throat, loss of reflexes by the mucous membrane of the pharynx.