What muscle raises and draws back the upper lip while also elevating the nostrils?

The muscle responsible for raising and drawing back the upper lip while elevating the nostrils is the Quadratus labii superioris. This muscle plays a significant role in facial expression; it is located above the upper lip and connects to the zygomatic bone. When the Quadratus labii superioris contracts, it elevates the upper lip, enabling facial expressions associated with disdain or skepticism. Additionally, its action on the nostrils results in their elevation, which can enhance expressions of surprise or curiosity.

Understanding the roles of facial muscles is essential for estheticians, as they relate to how treatments and procedures can influence both appearance and expression.