human_reference_atlas Homo sapiens orbicularis oculi muscle http://upload.wikimedia.org/wikipedia/commons/e/e2/Gray379.png FMA:46779 uberon Wikipedia:Orbicularis_oculi_muscle EMAPA:35619 MA:0001254 A circumorbital muscle in the face that closes the eyelid[HP]. AS orbicularis oculi muscle tensor tarsi UMLS:C0224122 musculus orbicularis oculi orbicularis oculi muscle NCIT:C52886 UBERON:0001578 SCTID:244726006 orbicularis oculi 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. From this origin, the fibers are directed lateralward, forming a broad and thin layer, which occupies the eyelids or palpebræ, surrounds the circumference of the orbit, and spreads over the temple, and downward on the cheek. The palpebral portion of the muscle is thin and pale; it arises from the bifurcation of the medial palpebral ligament, forms a series of concentric curves, and is inserted into the lateral palpebral raphé. The orbital portion is thicker and of a reddish color; its fibers form a complete ellipse without interruption at the lateral palpebral commissure; the upper fibers of this portion blend with the Frontalis and Corrugator. The lacrimal part (Tensor tarsi) is a small, thin muscle, about 6 mm. in breadth and 12 mm. in length, situated behind the medial palpebral ligament and lacrimal sac. It arises from the posterior crest and adjacent part of the orbital surface of the lacrimal bone, and passing behind the lacrimal sac, divides into two slips, upper and lower, which are inserted into the superior and inferior tarsi medial to the puncta lacrimalia; occasionally it is very indistinct. [WP,unvetted]. [Wikipedia:Orbicularis_oculi_muscle] muscle organ muscle of facial expression