False-colour SEM of cells on the iris of the eye

False-colour SEM of cells on the iris of the eye

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This image is part of the feature Windows Of The Soul


Caption: False-colour scanning electron micrograph (SEM) of surface cells on the iris of the eye. The iris is the coloured part of the eye behind the cornea. Pigment cells (melanocytes, blue & brown) can be seen here, joined loosely together by connective tissue fibres (white). Smaller macrophage cells dot the surface. Beneath this matrix (stroma) of iris cells lie muscle fibres. These muscle fibres contract and dilate reflexively, and so control light entering the central pupil of the iris, and falling on the retina. Mobility of the iris is possible through this loose network structure of cells. Magnification: x540 at 6x7cm size. Magnification: x830 at 4x5 inch size.

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Keywords: anatomy, eye, false-coloured, human body, iris, melanocyte, sight, vision, visual sense

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