Nerve cell. Confocal light micrograph of a nerve cell (neuron, yellow) from the retina of the eye. The cell has numerous processes (dendrites) emerging from its body. The red areas are red blood cells (erythrocytes) in nearby blood vessels. The small blue dots are gap junctions (nexuses). These are passages between adjacent cells that allow the exchange of small molecules and ions. Retinal neurons carry visual information from the photoreceptors (not seen) to the optic nerve. Magnification unknown.