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
References in periodicals archive ?
Intraoperative injection of botulinum toxin A into the orbicularis oculi muscle for the treatment of crow's feet.
Regional differences in the orbicularis oculi muscle: conservation between species.
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. Secretions flow across the eye toward the puncta near the medial canthus.
With redundant lower eyelid skin and insufficient adhesion of the orbicularis oculi muscle to the tarsal plate, the result is a displaced skin crease above the tarsal plate.
Priming dose of atracurium: measuring orbicularis oculi muscle fade and tracheal intubation conditions.
The apparent advantages of endonasal DCR over external DCR are its less invasive nature, shorter operative time and preservation of pump function of the orbicularis oculi muscle due to the absence of an external skin and orbicularis incision.
In this context, an experiment has been undertaken in Norway by a team of researchers to investigate the development of discomfort symptoms in relation to muscle activity and muscle blood flow in the orbicularis oculi muscle during computer work.
1 patient (4%) had only decreased tone of orbicularis oculi muscle bilaterally, with no true lagophthalmos.