Alberta Written Barber Practice Exam

Which muscle is responsible for smiling?

1. Orbicularis oculi

2. Zygomaticus major

3. Frontalis

4. Platysma

The correct answer is: Zygomaticus major

The muscle responsible for smiling is the zygomaticus major. This muscle plays a significant role in facial expression by elevating the corners of the mouth, which is essential for creating the smiling expression. When the zygomaticus major contracts, it pulls the mouth upwards and laterally, contributing directly to the visible smile that expresses joy and happiness. In the context of facial anatomy, the zygomaticus major connects from the zygomatic bone (cheekbone) to the corners of the mouth, thus positioning it ideally for its purpose in smiling. The synergy between the zygomaticus major and surrounding muscles, like the orbicularis oris, enhances the smile’s overall expression. The other options refer to different muscles with distinct functions. For instance, the orbicularis oculi is primarily responsible for closing the eyelids and can contribute to expressions of joy by creating crow's feet during a genuine smile, but it does not actively create the smile itself. The frontalis muscle elevates the eyebrows and wrinkles the forehead, also not directly involved in smiling. The platysma is a muscle of the neck that assists in movements that lower the jaw and tighten the skin of the neck, which is unrelated to smiling. Therefore,