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The orbicularis oris is not a simple sphincter muscle like the orbicularis oculi; 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.
Insertion: In the fibers of the orbicularis oris: Artery: Buccal artery: Nerve: Buccal branch of the facial nerve (VII cranial nerve) Actions: The buccinator compresses the cheeks against the teeth and is used in acts such as blowing. It is an assistant muscle of mastication (chewing) and in neonates it is used to suckle. Identifiers; Latin ...
It is contributed to by at least nine muscles: orbicularis oris, buccinator, levator anguli oris, depressor anguli oris, zygomaticus major, zygomaticus minor, risorius, quadratus labii superioris, quadratus labii inferioris. [1] [2] Its position and movements are important in moving the mouth, facial expression and in prosthetic dentistry. It ...
orbicularis oris, labial part head, mouth (left/right) ... Insertion The attachment point of the muscle, on a bone or otherwise, that moves during the action.
Orbicularis oris: Tissue surrounding lips: Underneath skin at corners of the mouth Lateral movement of cheeks (e.g., sucking on a straw; also used to compress air in mouth while blowing) Cheeks: Lateral: Buccinator: Maxilla, mandible; sphenoid bone (via pterygomandibular raphae) Orbicularis oris: Pursing of lips by straightening them laterally ...
The lower deep branches supply the buccinator and orbicularis oris, and join with filaments of the buccinator branch of the mandibular nerve. Muscles of facial expression
The levator anguli oris (caninus) is a facial muscle of the mouth arising from the canine fossa, immediately below the infraorbital foramen. It elevates angle of mouth medially. Its fibers are inserted into the angle of the mouth, intermingling with those of the zygomaticus , triangularis , and orbicularis oris .
The depressor anguli oris arises from the lateral surface of the mandible. [1] Its fibers then converge. It is inserted by a narrow fasciculus into the angle of the mouth. [1] At its origin, it is continuous with the platysma muscle, and at its insertion with the orbicularis oris muscle and risorius muscle.