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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.
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 ...
fibres of orbicularis oris: buccal artery: facial nerve [CNVII], buccal branch: compress cheeks against teeth (blowing), mastication: 2 1 orbicularis oris, marginal part head, mouth (left/right) maxilla and mandible: skin around lips: superior labial artery, inferior labial artery: facial nerve [CNVII], buccal branch: puckers lips: 2 2 ...
Cupid's bow feature of a human lip. The upper and lower lips are referred to as the labium superius oris and labium inferius oris, respectively. [2] [3] The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, [4] and the typically reddish area within the borders is called the vermilion zone. [5]
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 ...
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: musculus ...
The posterior lacrimal crest is just behind the lacrimal sac, and its upper part lodges the lacrimal sac. [3] [4] The lower part lodges the nasolacrimal duct.Horner's muscle, part of the orbicularis oris muscle, inserts between 2 mm and 4 mm from the posterior lacrimal crest. [5]
The levator palpebrae superioris receives motor innervation from the superior division of the oculomotor nerve. [1] [2] [3] The smooth muscle that originates from its undersurface, called the superior tarsal muscle is innervated by postganglionic sympathetic axons from the superior cervical ganglion.