| pars labialis musculi orbicularis oris | <anatomy> The major part of the orbicularis oris muscle within the body of the lips. Synonym: pars labialis musculi orbicularis oris. (05 Mar 2000) |
|---|---|
| pars lacrimalis musculi orbicularis oculi | <anatomy> See: orbicularis oculi muscle. Synonym: pars lacrimalis musculi orbicularis oculi, Duverney's muscle, Horner's muscle, musculus tensor tarsi. (05 Mar 2000) |
| pars marginalis musculi orbicularis oris | <anatomy> The part of the orbicularis oris muscle located in the margin of the lips, i.e., the red area. Synonym: pars marginalis musculi orbicularis oris. (05 Mar 2000) |
| pars orbitalis musculi orbicularis oculi | pars orbitalis musculi orbicularis oculi |
| pars palpebralis musculi orbicularis oculi | pars palpebralis musculi orbicularis oculi |
| visual orbicularis reflex | Contraction of the orbicularis oculi muscle caused by a sudden visual stimulus. See: wink reflex. (05 Mar 2000) |
| psoriasis orbicularis | Psoriasis in which healing is taking place at the centre of the lesion while the process continues at the periphery, producing a ring-shaped or annular lesion. Synonym: psoriasis annularis, psoriasis annulata, psoriasis orbicularis. (05 Mar 2000) |
| sign of the orbicularis | In hemiplegia, inability to voluntarily close the eye on the paralysed side except in conjunction with closure of the other eye. Synonym: Revilliod's sign. (05 Mar 2000) |
| orbicularis | 1. Circular; denoting a circular or disk-shaped structure. Synonym: orbicularis muscle. Origin: L. Fr. Orbiculus, a small disk (05 Mar 2000) |
| orbicularis muscle | <anatomy> A sphincter-like sheet of muscle that encircles an orifice such as the mouth or the palpebral fissures. Synonym: musculus orbicularis, orbicular muscle, orbicularis. (05 Mar 2000) |
| orbicularis oculi muscle | <anatomy> 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's or Horner's muscle) arises from posterior lacrimal crest and passes across lacrimal sac to join palpebral portion; action, closes eye, wrinkles forehead vertically; nerve supply, facial. Synonym: musculus orbicularis oculi, musculus orbicularis palpebrarum, orbicular muscle of eye, sphincter oculi. (05 Mar 2000) |
| orbicularis oculi reflex | Contraction of the orbicularis oculi muscles upon tapping the margin of the orbit, or the bridge or tip of the nose. Synonym: nose-bridge-lid reflex, nose-eye reflex. (05 Mar 2000) |
| orbicularis oris | <anatomy, muscle> Origin, by nasolabial band from septum of the nose, by superior incisive bundle from incisor fossa of maxilla, by inferior incisive bundle from lower jaw each side of symphysis; insertion, fibres surround mouth between skin and mucous membrane of lips and cheeks, and are blended with other muscles; action, closes lips; nerve supply, facial. Synonym: musculus orbicularis oris, musculus sphincter oris, orbicular muscle of mouth, sphincter oris. (05 Mar 2000) |
| orbicularis phenomenon | A constriction of both pupils when an effort is made to close eyelids forcibly held apart. A variant of the pupil response to near vision. Synonym: Galassi's pupillary phenomenon, Gifford's reflex, lid-closure reaction, orbicularis phenomenon, orbicularis pupillary reflex, Piltz sign, Westphal's pupillary reflex, Westphal-Piltz phenomenon. (05 Mar 2000) |
| orbicularis pupillary reflex | A constriction of both pupils when an effort is made to close eyelids forcibly held apart. A variant of the pupil response to near vision. Synonym: Galassi's pupillary phenomenon, Gifford's reflex, lid-closure reaction, orbicularis phenomenon, orbicularis pupillary reflex, Piltz sign, Westphal's pupillary reflex, Westphal-Piltz phenomenon. (05 Mar 2000) |