| planum occipitale | The external surface of the occipital bone above the superior nuchal line. Synonym: planum occipitale. (05 Mar 2000) |
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| planum orbitale | The orbital surface of the maxilla, lying perpendicular to the orbitomeatal plane at the orbitale. Synonym: planum orbitale. (05 Mar 2000) |
| planum popliteum | The posterior surface of the lower end of the femur between the diverging lips of the linea aspera. Synonym: facies poplitea femoris, planum popliteum, popliteal plane of femur. (05 Mar 2000) |
| planum semilunatum | The area of epithelium bounding the sensory area of the crista ampullaris. (05 Mar 2000) |
| planum sphenoidale | A plane surface on the sphenoid bone, in front of the sella turcica, connecting the two lesser wings, and forming part of the anterior cranial fossa and especially later in life, the roof of the anteriormost portion of the sphenoidal sinus. Synonym: planum sphenoidale. (05 Mar 2000) |
| planum sternale | A plane indicated by the front surface of the sternum. Synonym: planum sternale. (05 Mar 2000) |
| planum subcostale | A horizontal plane passing through the inferior limits of the costal margin, i.e., the tenth costal cartilages; it marks the boundary between the hypochondriac and epigastric regions superiorly and the lateral and umbilical regions inferiorly. Synonym: planum subcostale, infracostal line. (05 Mar 2000) |
| planum supracristale | A horizontal plane passing through the summits of the iliac crests; it usually passes through the fourth lumbar spinous process. Synonym: planum supracristale, supracrestal plane. (05 Mar 2000) |
| planum temporale | 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) |
| planum transpyloricum | 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) |
| haemangioma planum extensum | A benign, flat, cutaneous haemangioma of considerable size. (05 Mar 2000) |
| os planum | A type of bone characterised by its thin, flattened shape, such as the scapula or certain of the cranial bones. Synonym: os planum. (05 Mar 2000) |