Final answer:
Option 3. The arrow pointing to the 'trigeminal ganglion' indicates the location of the left trigeminal nerve. The facial nerve is responsible for the gag reflex and taste in the anterior oral cavity.
Step-by-step explanation:
The trigeminal nerve is one of the cranial nerves that has several functions, including receiving sensation from the face and controlling the muscles necessary for chewing. When identifying which arrow points to the left trigeminal nerve, you would look for the arrow that points to the area labeled 'trigeminal ganglion,' as this is the location where the trigeminal nerve's cell bodies are clustered.
The trigeminal nerve, specifically the left trigeminal nerve, can be identified as arrow 3. C. The trigeminal nerve is responsible for sensory information such as touch, pain, and temperature from the face, as well as controlling the muscles involved in chewing.
Regarding other cranial nerves, the facial nerve (b. facial) is responsible for controlling the muscles that result in the gag reflex, and this nerve is also responsible for taste, as well as salivation, in the anterior oral cavity (a. facial), unlike the glossopharyngeal and vagus nerves, which have different functions.