Coloured SEM of a section through the human retina

Coloured SEM of a section through the human retina

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Credit: PHOTO INSOLITE REALITE & V. GREMET/SCIENCE PHOTO LIBRARY

Caption: Retinal cells. Coloured Scanning Electron Micrograph (SEM) of a section through the human retina. The retina is the light-sensitive layer at the back of the eye. Light sensitive cells are known as rods and cones, and these cells are long and yellow (at upper image). At lower image (pink) are the bodies of nerve cells which transmit impulses from the rods and cones to the brain via the optic nerve. The surface of the retina, from where light enters this layer, is at bottom of image (not seen). Rods contain a pigment, rhodopsin, which is broken down by light and transmits a signal to nerve cells. Cone cells detect colour. Magnification: x1400 when printed 10cm wide.

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Keywords: anatomy, cell, cones, eye, human body, retina, rods, rods and cones, sight, vision, visual sense

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