Final answer:
Cranial nerve IX is known as the Glossopharyngeal nerve, it is responsible for sensory and motor innervation in areas of the throat and tongue, and is a mixed nerve.
Step-by-step explanation:
Cranial nerve IX, also known as the Glossopharyngeal nerve, is responsible for both sensory and motor functions. It provides sensory innervation to parts of the throat, the middle ear, and the back of the tongue (taste). In terms of motor function, it helps to coordinate the movement of muscles in the throat that are essential for swallowing and speech. The Glossopharyngeal nerve is a mixed nerve, indicating that it contains both sensory (afferent) and motor (efferent) fibers, and thus its type of innervation includes both sensory and motor functions.