Glow Up and Ace the Michigan Esthetician State Board Test 2025 – Beautify Your Future!

The muscle responsible for drawing the corner of the mouth out and back, as in grinning, is the Risorius. This muscle is located in the face and plays a role in facial expression. Specifically, it assists in actions such as smiling or grinning by pulling the corners of the mouth laterally, which contributes to expressions of joy or amusement.

The function of the Risorius muscle is crucial in creating a wide smile, as it helps to stretch the mouth horizontally. Understanding this muscle's role is important for estheticians who may be focusing on facial aesthetics and the effects of various treatments on expressions and facial appearance.

In contrast, other muscles listed have different functions. For instance, the Platysma is a thin, superficial muscle that runs from the jaw down to the chest and is more associated with lowering the mandible and contributes to facial expressions related to tension or stress. The Zygomaticus muscles (major and minor), located near the cheekbones, also play a key role in smiling; however, they specifically elevate the corners of the mouth rather than drawing them back. The Buccinator, primarily located in the cheek, aids in chewing and keeping food positioned between the teeth but does not have a primary function in creating a grin