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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.
The orbicularis oculi is a muscle in the face that closes the eyelids. It arises from the nasal part of the frontal bone , from the frontal process of the maxilla in front of the lacrimal groove , and from the anterior surface and borders of a short fibrous band, the medial palpebral ligament .
Its fibers are inserted into the angle of the mouth, intermingling with those of the zygomaticus, triangularis, and orbicularis oris. Specifically, the levator anguli oris is innervated by the buccal branches of the facial nerve .
Origin The bone or other structure the muscle is attached to that remains immobile during the action. The term "bone" is omitted from bone names. Insertion The attachment point of the muscle, on a bone or otherwise, that moves during the action. Artery The artery which supplies the muscle with blood.
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 ...
Origin: Inferior surface of lesser wing of sphenoid: Insertion: Superior tarsal plate and skin of upper eyelid: Artery: Muscular branches of ophthalmic artery and supraorbital artery: Nerve: Superior division of oculomotor nerve: Actions: Elevation of upper eyelid: Antagonist: Palpebral part of orbicularis oculi muscle: Identifiers; Latin ...
At its origin, it is continuous with the platysma muscle, and at its insertion with the orbicularis oris muscle and risorius muscle. Some of its fibers are directly continuous with those of the levator anguli oris muscle , and others are occasionally found crossing from the muscle of one side to that of the other; these latter fibers constitute ...
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 ...