Cranial Nerve IX (Glossopharyngeal Nerve)

The glossopharyngeal nerve is a mixed sensory and motor nerve that innervates part of the tongue and pharynx. The motor fibers innervate the muscles of the pharynx and the salivary gland to stimulate the swallowing reflex and secretion of saliva. The sensory fibers provide the sensation of taste for bitter and sour taste perception