GROSS ANATOMY

Detailed explanation-1: -The glossopharyngeal nerve is the ninth set of 12 cranial nerves (CN IX). It provides motor, parasympathetic and sensory information to your mouth and throat. Among its many functions, the nerve helps raise part of your throat, enabling swallowing.

Detailed explanation-2: -As stated above, the glossopharyngeal nerve provides motor innervation to the stylopharyngeus muscle, which is responsible for elevating the pharynx and larynx.

Detailed explanation-3: -The glossopharyngeal nerve carries many types of nerve fibers and has multiple functions, regulating: Taste sensations from the rearmost third of the tongue. Sensations from the tonsils, back of the throat, middle ear, and the area behind the ear. The stylopharyngeus muscle during swallowing.

Detailed explanation-4: -The glossopharyngeal nerve as noted above is a mixed nerve consisting of both sensory and motor nerve fibers. The sensory fibers’ origin include the pharynx, middle ear, posterior one-third of the tongue (including taste buds); and the carotid body and sinus. These fibers terminate at the medulla oblongata.