orbicularis oculi muscle


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or·bi·cu·la·ris oc·u·li mus·cle

(ōr-bik'yū-lā'ris ok'yū-lī mŭs'ĕl)
Consists of three portions: orbital part, or external portion, which arises from frontal process of maxilla and nasal process of frontal bone, encircles aperture of orbit, and is inserted near origin; palpebral part, or internal portion, which arises from medial palpebral ligament, passes through each eyelid, and is inserted into lateral palpebral raphe; lacrimal part (tensor tarsi muscle, Duverney or Horner muscle), which arises from posterior lacrimal crest and passes across lacrimal sac to join palpebral portion; action, closes eye, wrinkles forehead vertically; nerve supply, facial.
Synonym(s): musculus orbicularis oculi [TA] .

orbicularis oculi muscle

Facial muscle. Origin: completely surrounds eye, attaches to medial palpebral ligament (and adjacent bones) and lacrimal crest (and adjacent bones). Insertion: medial palpebral raphe (after encircling orbit), lateral palpebral raphe, tarsi of eyelids. Nerve: facial (CN VII) Action: closes eyelids, lifts cheeks, compresses lacrimal sac.
See: face and headfor illus.
See also: muscle

orbicularis oculi muscle

see Table 13.1F.
References in periodicals archive ?
Intraoperative injection of botulinum toxin A into the orbicularis oculi muscle for the treatment of crow's feet.
Another reason for this complication may be the toxicity of local anesthetics to the peripheral fibers of the facial nerve or orbicularis oculi muscle fibers.
Facial skin suffers atrophic changes; the force of gravity is no longer opposed by the orbicularis oculi muscle tone and the tarsus is often too shrunk, causing lower eyelid retraction.
Lacrimal secretions drain by action of the orbicularis oculi muscle.
Blunt dissection is carried deep to the orbicularis oculi muscle to the tarsal plate.
7] A blunt dissection was performed through the orbicularis oculi muscle, down to the periosteum, shortly after making a skin incision.
The findings on light microscopy of the eyelids in pachydermoperiostosis are thickening and sclerosis of the connective tissue between the orbicularis oculi muscle and the tarsal plate as well as a thickened tarsal plate due to meibomian gland hyperplasia and epidermalization of the conjunctival epithelium.