Light and electron microscopic structure of goat's retina

Abstract

The present study was conducting aiming to throw the light on the retinal structure on the level of both light and electron microscope. Eyeballs of 35 adult clinically healthy goats of both sexes were collected from Beni-Suef abattoir. The eyeballs were clinically examined before they were dissected and fixed in 10% buffed neutral formalin and in Bouin's solution for 24 hours. The specimens were then processed for light and transmission electron microscope. The retina (pars optica retinae) of the goats extends rostrally to cover the ciliary body as pars ciliaris retinae and the iris as the pars iridis retinae. Pars optica retinae and pars iridis retinae form the light non sensitive parts of the retina, while the sensitive part except at the transition zone; the ora serrata and the optic disc, appeared to be formed of ten layers, named from outward to inward as, retinal pigmented epithelium, rods and cones layer (photoreceptor cell layer), external limiting membrane, outer nuclear layer (cell bodies and nuclei of the photoreceptor cells), outer plexiform layer, inner nuclear layer (contained the horizontal, bipolar, Muller and amacrine cells), inner plexiform layer, ganglionic cell layer, nerve fiber cell layer (unmyelinated nerve fibers) and internal limiting membrane.

Temporospatial dynamics of the morphogenesis of the rabbit retina from prenatal to postnatal life: Light and electron microscopic study

“…The horizontal cells appear at end of gestational period, and its appearance resulting the neuroblastic cell layer is divided into the INL and ONL. In agreement with Soliman et al (2010) in goat, the processes of the horizontal cells run in parallel to the retinal surface. The horizontal cells are interneurons that involved in enhancing contrast between light and dark regions (Edqvist, 2006).…”

“…It remains occupying the inner margin of the inner nuclear layer. This simulated that described by Soliman et al (2010) in goat. The amacrine cells can synapse back onto bipolar cells, other amacrine cells, and ganglion cells.…”

“…The outer limiting membrane is formed by a series of zonula adherens between the Muller cell processes and the photoreceptors (Soliman et al, 2010). It is believed that this type of junction binds cells less firmly than do desmosomes or zonula occludens (Lentz & Trinkaus, 1971) and permits the passage of some materials between the cells (Peyman et al, 1971).…”

“…Rods are mainly involved in vision under dim light conditions, whereas the cones are normally involved in vision during bright light and are also responsible for color vision (Edqvist, 2006). The outer limiting membrane is formed by a series of zonula adherens between the Muller cell processes and the photoreceptors (Soliman et al, 2010). It is believed that this type of junction binds cells less firmly than do desmosomes or zonula occludens (Lentz & Trinkaus, 1971) and permits the passage of some materials between the cells (Peyman et al, 1971).…”