orbicularis oculi muscle

(redirected from musculus orbicularis oculi)

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] .
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
In addition, there were neurogenic involvement findings in the musculus orbicularis oculi and musculus orbicularis oris.
Electromyography (EMG) showed lower compound muscle action potential (CMAP) amplitude on the left facial nerve compared with the right side (facial nerve CMAP amplitude recording on musculus nasalis was 1.8 mV on the right and 0.7 mV on the left; facial nerve CMAP amplitude recording on musculus orbicularis oculi was 1.1 mV on the right and 0.2 mV on the left).

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