Superficial portion, called episclera, has rich vascular network Bilirubin accumulates in episclera to stain sclera yellow (icterus). Retina is a complex tissue comprising various cell types. Rod cells have an elongated structure and consist of four distinct regions An outer segment, an inner segment, the cell body, and the synaptic region The outer segment contains the phototransduction apparatus.
There are significantly more rod cells than cone cells in the retina, with the rods located in the outer areas of the retina and the cones being in the centre of the retina, known as the macula. This article describes the organization, types, and functions of photoreceptors (rods and cones) in the retina Rods are unresolved in this image, but are likely to be nestled in the dark gaps between cones. Cross section of the retina Rods are visible at far right Rod cells, or rods, are photoreceptor cells in the retina of the eye that can function in less intense light than can the other type of photoreceptor, cone cells
