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Micrograph of an ameloblastoma showing characteristic palisading. H&E stain. In histopathology, a palisade is a single layer of relatively long cells, arranged loosely perpendicular to a surface and parallel to each other. [1] A rosette is a palisade in a halo or spoke-and-wheel arrangement, surrounding a central core or hub. [2]
Reconstruction of a palisade in a Celtic village at St Fagans National History Museum, Wales Reconstruction of a medieval palisade in Germany. A palisade, sometimes called a stakewall or a paling, is typically a row of closely placed, high vertical standing tree trunks or wooden or iron stakes used as a fence for enclosure or as a defensive wall.
Palisade cells are located beneath the upper epidermis and cuticle but above the spongy mesophyll cells.. Palisade cells contain a high concentration of chloroplasts, particularly in the upper portion of the cell, making them the primary site of photosynthesis in the leaves of plants that contain them.
Verocay bodies are a component of "Antoni A" which are the dense areas of schwannomas located between palisading spindle cells found in neoplasms. Two nuclear palisading regions and an anuclear zone make up one Verocay body. [1] Originally Verocay bodies were called 'neuromas', a term coined by Louis Odier in 1803.
A rheumatoid nodule is a lump of tissue, or an area of swelling, that appears on the exterior of the skin usually around the olecranon (tip of the elbow) or the interphalangeal joints (finger knuckles), but can appear in other areas. [1]
Columnar basalt, a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet . List of places with columnar jointed volcanics
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A histiocyte is a vertebrate cell that is part of the mononuclear phagocyte system (also known as the reticuloendothelial system or lymphoreticular system). The mononuclear phagocytic system is part of the organism's immune system.