Final answer:
The levator anguli oris, also known as the caninus, is a muscle that elevates the corners of the mouth, aiding in expressions such as smiling. It is located near the orbicularis oris, which is a circular muscle important for oral functions and facial expressions.
Step-by-step explanation:
The other name for the levator anguli oris muscle is the caninus. This muscle is located underneath the skin at the corners of the mouth, and it works in concert with other facial muscles, like the orbicularis oris, which is a circular muscle that regulates what comes in and goes out of the mouth, and the buccinator muscles in the cheeks. The levator anguli oris is responsible for lifting the angles of the mouth and is involved in facial expressions like smiling.
The orbicularis oris is quite significant as it not only controls oral functions such as speaking and eating but also plays a role in emotional expression and social behaviors like kissing due to its circular muscle structure, which allows for the puckering of lips. The muscle's action and interaction with other facial muscles highlight the intricate nature of facial expressions and their importance in nonverbal communication.