The zygomaticus major is a muscle located in the face, extending from the zygomatic bone to the corners of the mouth. It plays a crucial role in facial expressions, particularly in smiling, as it helps elevate the corners of the mouth. This muscle is essential for conveying emotions and social interactions. Anatomically, the zygomaticus major is part of the group of muscles known as the facial muscles. It is innervated by the facial nerve, which controls various facial movements. Understanding the zygomaticus major is important in fields like anatomy, cosmetic surgery, and neurology.