| intermediary plane | <microscopy> When in an optical system several successive real image planes of an object are formed, reticles or diaphragms can be inserted at an intermediate plane for superposition on the final image. (05 Aug 1998) |
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| intermediate image plane | <microscopy> In a light microscope, the plane into which the objective lens directly focuses the image of the specimen. The plane is usually located a set distance (commonly 10 mm) below the shoulder for the ocular and another fixed distance (generally 160 mm) behind the rear focal plane of the objective lens. The ocular forms a virtual image of the intermediate image for visual observation, or projects a real image for photography and video microscopy. Note: The objective lens, combined with the coverslip of proper thickness, is corrected for projecting the primary image to the specified intermediate image plane only. (05 Aug 1998) |
| interspinal plane | A horizontal plane passing through the anterior superior iliac spines; it marks the boundary between the lateral and umbilical regions superiorly and the inguinal and pubic regions inferiorly. Synonym: planum interspinale, Lanz's line. (05 Mar 2000) |
| intertubercular plane | A horizontal plane passing through the iliac tubercles. Synonym: planum intertuberculare. (05 Mar 2000) |
| occipital plane | The external surface of the occipital bone above the superior nuchal line. Synonym: planum occipitale. (05 Mar 2000) |
| occlusal plane | <dentistry> The imaginary surface on which upper and lower teeth meet. (08 Jan 1998) |
| orbital plane | The orbital surface of the maxilla, lying perpendicular to the orbitomeatal plane at the orbitale. Synonym: planum orbitale. (05 Mar 2000) |
| 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) |
| temporal plane | A slightly depressed area on the side of the cranium, below the inferior temporal line, formed by the temporal and parietal bones, the greater wing of the sphenoid, and a part of the frontal bone. Synonym: planum temporale. (05 Mar 2000) |
| third parallel pelvic plane | The plane that extends from the end of the sacrum to the inferior border of the pubic symphysis; it is bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the inferior border of the pubic symphysis. Synonym: midplane, plane of least pelvic dimensions, plane of midpelvis, third parallel pelvic plane. (05 Mar 2000) |
| tooth plane | Any one of the imaginary plane's of section of a tooth, such as the axial, horizontal, or vertical. (05 Mar 2000) |
| transaxial plane | Transverse plane, as in CT scanning. Synonym: transaxial plane. (05 Mar 2000) |
| transpyloric plane | A horizontal plane midway between the superior margins of the manubrium sterni and the symphysis pubis; the pylorus is not usually located on this plane in life. Synonym: planum transpyloricum. (05 Mar 2000) |
| transverse plane | A plane across the body at right angles to the coronal and sagittal plane's. Synonym: horizontal plane. (05 Mar 2000) |
| equatorial plane | In metaphase of mitosis, the plane that touches all of the centromeres and their spindle attachments. (05 Mar 2000) |