Maxilla and mandible; Circular muscle around the mouth.
The orbicularis oris muscle is a sphincter muscle that encircles the mouth. It lies between the skin and the mucous membranes of the lips, extending upward to the nose and down to the region between the lower lip and chin. InnerBody
Skin around the lips; Closes and protrudes lips.
Integument of the lower lip, Orbicularis oris fibers, its fellow of the opposite side. It consists of numerous strata of muscular fibers surrounding the orifice of the mouth, but having different direction. It consists partly of fibers derived from the other facial muscles which are inserted into the lips, and partly of fibers proper to the lips. Wiki
It is sometimes known as the kissing muscle because it is used to pucker the lips.
The orbicularis oris muscle causes depression of the lower lips.
Cranial nerve VII, buccal branch of the facial nerve.
Facial nerve – Mandibular branch. Nerve signals from the cranial nerve play important roles in sensing taste as well as controlling the muscles of the face, salivary glands, and lacrimal glands. InnerBody
Inferior, superior branches of the facial artery.
The inferior labial artery (inferior labial branch of facial artery) arises near the angle of the mouth; it passes upward and forward beneath the Triangularis and, penetrating the Orbicularis oris, runs in a tortuous course along the edge of the lower lip between this muscle and the mucous membrane. Wiki
The superior labial artery (superior labial branch of facial artery) is larger and more egregious than the inferior labial artery. It follows a similar course along the edge of the upper lip, lying between the mucous membrane and the Orbicularis oris, and anastomoses with the artery of the opposite side. Wiki
Pictures of muscles
Trigger Point Referrals