Retina layers, SEM

Retina layers, SEM


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Retina layers, coloured scanning electron micrograph (SEM). The retina of the human eye is found on the inside of the eyeball and is formed from a number of layers. The light-detecting part is formed of rod and cone photoreceptor cells. The lower third of this image contains the blood vessels and nerves that form the upper layer. The light entering our eyes has to penetrate though this layer to reach the tightly packed photosensitive 'outer segments' of the photoreceptors (top third of image) which lie just below a layer of retinal pigment epithelium cells (top). Magnification: x480 when printed at 10 centimetres across.

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