| infraorbital margin | The inferior half of the orbital rim, or the lower border of the orbital opening, formed by the maxilla medially and the zygomatic bone laterally. See: orbital rim. Synonym: margo infraorbitalis. (05 Mar 2000) |
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| infraorbital nerve | <anatomy, nerve> The continuation of the maxillary nerve after it has entered the orbit, via the infraorbital fissure, traversing the infraorbital canal to reach the face; it supplies the mucosa of the maxillary sinus, the upper incisors, canine and premolars, the upper gums, the inferior eyelid and conjunctiva, part of the nose and the superior lip. Synonym: nervus infraorbitalis. (05 Mar 2000) |
| infraorbital region | The region of the face below the orbit and alongside the nose on each side. Synonym: regio infraorbitalis. (05 Mar 2000) |
| infraorbital suture | An inconstant suture running from the infraorbital foramen to the infraorbital groove. Synonym: sutura infraorbitalis. (05 Mar 2000) |
| infraorbitomeatal 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) |
| infrapalpebral sulcus | The hollow or furrow below the lower eyelid. Synonym: sulcus infrapalpebralis. (05 Mar 2000) |
| infrapatellar | Inferior to the patella; denoting especially a bursa, a pad of fat, or a synovial fold. Synonym: subpatellar. (05 Mar 2000) |
| infrapatellar branch of saphenous nerve | Branch of saphenous nerve supplying skin over and below patella. Synonym: ramus infrapatellaris nervi sapheni. (05 Mar 2000) |
| infrapatellar fat body | The fatty mass that occupies the area between the patellar ligament and the infrapatellar synovial fold of the knee joint. Synonym: corpus adiposum infrapatellare, infrapatellar fat body. (05 Mar 2000) |
| infrapatellar fat-pad | The fatty mass that occupies the area between the patellar ligament and the infrapatellar synovial fold of the knee joint. Synonym: corpus adiposum infrapatellare, infrapatellar fat body. (05 Mar 2000) |
| infrapatellar synovial fold | A fold of synovial membrane extending from below the level of the articular surface of the patella to the anterior part of the intercondylar fossa. Synonym: plica synovialis infrapatellaris, plica synovialis patellaris. (05 Mar 2000) |
| infrapsychic | Denoting ideas or actions originating below the level of consciousness. (05 Mar 2000) |
| infrared | That portion of the electromagnetic spectrum with wavelengths between 770 and 1000 nm. (05 Mar 2000) |
| infrared cataract | A cataract secondary to absorption of heat by the lens, or by transmission from the adjacent iris. Synonym: furnacemen's cataract, glassworker's cataract. (05 Mar 2000) |
| infrared light | See: infrared. Invisible light, historic term for X-rays. (05 Mar 2000) |