Final answer:
The glossopharyngeal nerve is correctly referred to as cranial nerve IX, and this statement is true. It is involved in muscle contraction in the tongue and throat, taste, and saliva production.
Step-by-step explanation:
The glossopharyngeal nerve is indeed also called the cranial nerve IX. This statement is true. The glossopharyngeal nerve is responsible for various functions, including the contraction of muscles in the tongue and throat, a portion of the sense of taste, and triggering saliva production. Together with the facial nerve, the glossopharyngeal nerve conveys taste information to the brain.
The gag reflex can also be stimulated by the glossopharyngeal nerve through sensations from the pharyngeal walls, while the motor functions of the pharynx related to the gag reflex and swallowing are largely mediated by the vagus nerve (cranial nerve X). Both ninth and tenth cranial nerves are essential in the cervical plexus and play a role in the functioning of the head and neck, but the glossopharyngeal nerve is specifically the ninth cranial nerve.
The statement that Glossopharyngeal is also called the cranial nerve IX is False.
The glossopharyngeal nerve, also known as cranial nerve IX, is responsible for the contraction of muscles in the tongue and throat and for part of the sense of taste, as well as causing saliva production.
The cranial nerves play a crucial role in various functions of the head and neck, including sensory and motor functions.
Therefore answer is 1. True.