| orbitale | In cephalometrics, the lowermost point in the lower margin of the bony orbit that may be felt under the skin. Origin: L. Of an orbit (05 Mar 2000) |
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| orbitalis muscle | <anatomy> A rudimentary nonstriated muscle, crossing the infraorbital groove and sphenomaxillary fissure, intimately united with the periosteum of the orbit. Synonym: musculus orbitalis, Muller's muscle, orbital muscle. (05 Mar 2000) |
| orbitelae | <zoology> A division of spiders, including those that make geometrical webs, as the garden spider, or Epeira. Origin: NL, fr. L. Orbis an orb + tela a web. Source: Websters Dictionary (01 Mar 1998) |
| orbitofrontal artery | <anatomy, artery> A branch of the insular part of the middle cerebral artery distributed to the cortex of the lateral, inferior part of the frontal lobe. Synonym: arteria frontobasalis lateralis, ramus orbitofrontalis lateralis, lateral orbitofrontal branch, orbitofrontal artery. (05 Mar 2000) |
| orbitofrontal cortex | The cerebral cortex covering the basal surface of the frontal lobes. Synonym: fronto-orbital area. (05 Mar 2000) |
| orbitography | Radiographic evaluation of the orbit. Origin: L. Orbita, orbit, + G. Grapho, to write Positive contrast orbitography, orbitography with injection of a water soluble iodinated compound into the muscle cone or along the orbital floor. (05 Mar 2000) |
| orbitolites | <zoology> A genus of living Foraminifera, forming broad, thin, circular disks, containing numerous small chambers. Origin: NL. See Orbit, and -lite. Source: Websters Dictionary (01 Mar 1998) |
| orbitomeatal line | base line |
| orbitomeatal plane | A standard craniometric reference plane passing through the right and left porion and the left orbitale; drawn on the profile radiograph or photograph from the superior margin of the acoustic meatus to the orbitale. Synonym: auriculo-infraorbital plane, eye-ear plane, Frankfort horizontal plane, Frankfort plane, infraorbitomeatal plane. (05 Mar 2000) |
| orbitonasal | <anatomy> Of or pertaining to the orbit and the nose; as, the orbitonasal, or ophthalmic, nerve. Origin: Orbit + nasal. Source: Websters Dictionary (01 Mar 1998) |
| orbitonasal index | The ratio of the width between the lateral angles of the eyes, measured with a tape measure passing over the root of the nose times 100, to the width between the lateral angles of the eyes measured with a caliper. (05 Mar 2000) |
| orbitonometer | An instrument that measures the resistance offered to pressing the eyeball backwards into its socket. Origin: L. Orbita, orbit, + G. Metron, measure (05 Mar 2000) |
| orbitonometry | Measurement by means of the orbitonometer. (05 Mar 2000) |
| orbitopagus | Unequal conjoined twins in which the parasite, usually very imperfectly developed, is attached at an orbit of the autosite. See: conjoined twins. Synonym: teratoma orbitae. Origin: L. Orbita, orbit, + G. Pagos, something fixed (05 Mar 2000) |
| orbitopathy | Disease of the orbit and its contents. (05 Mar 2000) |