Retina Showing Rod Cells and Blood Vessel
A scanning electron micrograph of the retina in a guinea pig eye. To the left of the picture is the photoreceptor layer which contains the light-sensitive rod cells that help convert light impulses into an image in the brain. To the right is the choroid layer of the retina which contains a network of blood vessels like the one shown emerging here.
Credit: Dr David Furness, Wellcome Images