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Retina, SEM

Retina, SEM


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Retina, SEM

Retina. Coloured scanning electron micrograph (SEM) of a section through a freeze-fractured retina, showing the light-sensitive rods and cones and their associated neurones. Light entering the eyes passes through the bipolar neurones in the nuclear layers (purple, lower frame). It then hits the rods and cones (pink/yellow, upper frame). The rods, used in dim light, are found at the retinal margins. The cones, which control colour vision and acuity (sharpness), function best in bright light. They are concentrated in the centre of the retina. Information from both is passed to the neurons, which relay it to the optic nerve (not seen). Magnification: x1000 at 6x7cm size

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 6449335

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Bipolar Cone Cones Fibre Fibres Fracture Fractured Freeze Fractured Ganglion Histology Layer Layered Layers Light Sensitive Nerve Nervous Neuron Neurone Neurones Neurons Optic Optical Photoreceptor Photoreceptors Receptor Receptors Retina Retinal Rods Sight Tissue Vision Visual Sense Cells Section Sectioned


EDITORS COMMENTS
This print from Science Photo Library showcases the intricate beauty of the retina, a vital component of our visual system. In this coloured scanning electron micrograph (SEM), we are granted a glimpse into the complex layers and cells that make up this remarkable tissue. The image reveals an exquisite section through a freeze-fractured retina, highlighting the presence of light-sensitive rods and cones along with their associated neurones. The lower frame illustrates the bipolar neurones in purple, which play a crucial role in transmitting light entering the eyes. Moving to the upper frame, we observe the rods and cones depicted in pink and yellow respectively. These photoreceptor cells have distinct functions - while rods aid us in dim lighting conditions, cones enable us to perceive colors vividly and enhance sharpness when exposed to bright light. It is fascinating to note that these essential components are not uniformly distributed throughout the retina. Rods tend to be concentrated at its margins, catering specifically to low-light environments. On the other hand, cones dominate at its center where they facilitate color vision and acuity. Overall, this stunning SEM print offers an awe-inspiring insight into our visual sense's inner workings. With magnification set at x1000 for optimal clarity on a 6x7cm scale, it serves as both an educational tool for understanding retinal anatomy and a testament to nature's incredible design within our own bodies.

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