Meaning of Dunham. Celtic name. In Celtic, the name Dunham means - Dark skinned fighter.. Other origins for the name Dunham include - Celtic, Irish.The name Dunham is most often used as a boy name or male name. Celtic Name Meaning - Dark skinned fighter. Origin - Celtic.
eyeball. 1  Photoreceptors are the cells in the retina that respond to light. Their distinguishing feature is the presence of large amounts of tightly packed membrane that contains the photopigment rhodopsin or a related molecule.
Structure. The retina is a multi-layered sensory tissue that lines the back of the eye. It is approximately 0.5mm thick, and consists of an outer pigmented layer of specialised epithelial cells and an inner neural portion.The middle of the retina is called the macula, and the centre of the macula contains the fovea.tructure. The retina is a multi-layered sensory tissue that lines the back of the eye. It is approximately 0.5mm thick, and consists of an outer pigmented layer of specialised epithelial cells and an inner neural portion.