Histological Study of Dorsal Retina in Eye of Brown Falcon, Iraq

Abstract

The current research project aims to identify the histological structures of the dorsal retina in eye of brown falcon (Falco berigora). The results showed an existence of blood vessels in retinal tissues with presence a pair of layers in dorsal retina. The retina is comprised up double mainly layers; outer layer as a pigmented epithelium (PE) in addition to inner layer as neural layer that compromised of nine layers vision cells, which are constructed up of rods and cones and outer limiting membrane that contains External nuclear layer (ENL), External plexiform layer (EPL), Internal nuclear layer (INL), Internal plexiform layer (IPL), Ganglion cell layer (GCL), Optic nerve fiber layer (ONFL), and Inner limiting membrane (ILM). PE comprises the cells of cuboidal epithelium, and cytoplasmic extensions extend from its inner surface towards the optic cells. The visual cell layer contains rods and cones. Outer plexiform layer (OPL) is thinner than inner plexiform layer (IPL), and numbers of row of outer nuclear layer is less than those found in inner nuclear retinal layer of falcon. As a result, we conclude that difference in visual cell density has been linked to improved visual acuity and sensitivity to light intensity.