Retinal cell organization
STRUCTURE AND FUNCTION OF THE HUMAN RETINA

Advances in imaging have enabled deeper understanding of the retina and its structure. Several insights that are underrepresented in existing visual resources are illustrated here. Firstly, the correct densities and ratios of cell types are shown, including not only the cells responsible for signal transmission, but also those that are vital to structure, regeneration, and feedback. Secondly, the path that light travels to strike photoreceptors is clarified, as it influences the structure of the fovea. Lastly, the diversity of retinal cells is shown; cones evolved earlier than rods, and the cone-driven suite of cells is more diverse and complete, resulting in differences in how their signals reach the brain. Although a variety of morphologies is depicted within each cell layer, colour coding shows the retina as a layered structure. The use of coloured layers is repeated to simplify isolated cellular networks and draw associations between the various figures.

 

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