The levator palpebrae superioris muscle is responsible for lifting the upper eyelid. There are several synonyms for this muscle, including the superior levator muscle, superior palpebral muscle, Müller's muscle, and the upper eyelid muscle. These terms are commonly used interchangeably in the medical field to describe the same muscle. The levator palpebrae superioris muscle is an important component of the eye's anatomy and helps to protect and maintain vision. Understanding the various synonyms for this muscle can be helpful for medical professionals and those learning about the eye's function and structure.