The primary muscle involved in kissing is the orbicularis oris. While not strictly two separate "kissing muscles," the orbicularis oris is composed of two parts: the pars marginalis and the pars peripheralis. These work together to control lip movements.
Understanding the Orbicularis Oris
The orbicularis oris muscle is a complex circular muscle surrounding the mouth. It's crucial for various facial expressions, including kissing, whistling, and puckering. Its intricate structure, originating from several other facial muscles and converging at the modiolus (the corner of the mouth), allows for its precise and nuanced control.
- Pars marginalis: This part contributes to the more superficial layer of the lip muscle.
- Pars peripheralis: This comprises the deeper fibers of the muscle.
Although simple kisses may utilize fewer muscles, passionate kissing engages many more facial and postural muscles. One source mentions passionate kissing can involve as many as 23 to 34 facial muscles and 112 postural muscles. However, the orbicularis oris remains central to the action. The orbicularis oris's role in puckering makes it commonly referred to as the "kissing muscle."
References support this description: The provided text from StatPearls mentions the orbicularis oris muscle and its role in puckering, leading to its nickname, "kissing muscle." Furthermore, Study.com describes the two functional layers of this complex muscle. Finally, The American Journal of Medicine Blog highlights the increased muscle engagement during passionate kissing.
