The Triangularis muscle is responsible for which facial expression?

The Triangularis muscle, also known as the depressor anguli oris, plays a crucial role in the facial expression of frowning. This muscle is located at the corners of the mouth and when it contracts, it pulls the corners of the mouth downward. This downward movement is associated with expressions of sadness, disapproval, or concern, which are typically conveyed through frowning.

Understanding the function of the Triangularis muscle helps in recognizing how muscles contribute to a wide range of facial expressions, thereby enhancing one's knowledge about facial anatomy and its implications in esthetics and cosmetology.