ANATOMY

Detailed explanation-1: -Orbicularis oris muscle, also known as musculus orbicularis oris is a complex, multi-layered muscle which attaches through a thin, superficial musculoaponeurotic system to the dermis of the upper lip and lower lip and serves as an attachment site for many other facial muscles around the oral region.

Detailed explanation-2: -The lips are composed of the orbicularis oris muscle that surrounds the mouth and is covered externally by skin and internally by mucous membrane. The upper and lower lips are attached to the gingiva by raised folds of mucous membrane called the labial frenula.

Detailed explanation-3: -Orbicularis oris muscle The orbicularis oris is a circular composite muscle that surrounds the mouth and forms the majority of lips. It consists of two parts; labial and marginal, with the border between them corresponding to the margin between the lips and the surrounding skin.

Detailed explanation-4: -Orbicularis oris is a complex circular muscle that surrounds the orifice of the mouth and forms the majority of the lips. It belongs to a large group of muscles of facial expression called the buccolabial group.

Detailed explanation-5: -The muscle used for kissing is the orbicularis oris. The muscle encircles the mouth, can isolate parts, and the when the fibers contract the lips pucker.