Retina, Biology

Retina

As invagination of the optic vesicle carries on to form the double walled optic cup the two layers of the optic cup start to differentiate in different directions. Pigment is produced in the cells of the outer 1- cell thick layer that becomes the pigmented retina. The cells of the inner layer proliferate quickly, mainly in its germinal zone near the margin of the optic cup. From here the daughter -cells migrate into the deeper region of the inner layer raising its thickness.

These cells ultimately differentiate in a variety of cell types involving the light sensitive photoreceptor cells (cones and rods), glial cells, inter neurons (bipolar, horizontal, amacrine) and ganglion cells. Collectively these cells comprise the neural retina. The proliferation then occurs just only in the marginal zone of neural retina. Glial cells become the Muller's Fibers which make the packing tissue and the outer and inner limiting membranes on the outer and inner surfaces of the neural retina. The bipolar, horizontal and amacrine cells sense to connect the photoreceptor cone and rod cells along with each other and the ganglion cells via way of their axons and dendrites. The axons from the ganglion cells of the neural retina meet at the base of the eye to form the optic nerve that travels down the optic stalk and connects the neural retina along with the brain.

Posted Date: 1/29/2013 2:26:40 AM | Location : United States







Related Discussions:- Retina, Assignment Help, Ask Question on Retina, Get Answer, Expert's Help, Retina Discussions

Write discussion on Retina
Your posts are moderated
Related Questions
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Explain the Food Applications of Gum Arabic A major use for gum Arabic is in the confectionery industry where it has two important functions; to retard or to prevent crysta

NUMBER Benden and Boveri first indicated that number of Chromosomes is definite in each organism. (1) Haploid (n) - One set of Chromosomes. i.e. one Chromosome of each

Planning of Nursing Care   Promote nonnal urinary pattern or releive  excess  fluid  Administer medication  as prescribed  Protect the children from secondary  infecti

Define Carbohydrates needs in Postoperative Nutritional Care? Carbohydrates ensure the use of protein for tissue synthesis and energy required for increased metabolic demands.

Removal of obturating material -Gutta percha . -Carrier  bassed gutta perca. -silver points . - paste type. - obstructed fracture instrument .

Q. Etiologic factor of diabetes? The precise etiology of diabetes is not known but multiple factors contribute to the disorder. These are reviewed herewith. Type I Diabetes

Explain Precautions for Gram Staining of Bacterial Cultures? 1. The dilutions should be chosen on the basis of expected counts in the food sample. 2. Food should be kept in

Haemoglobin Among the respiratory pigments we shall consider haemoglobin in some detail as this is the most familiar, widespread as well as the most efficient respiratory pigm

Osmotic Strength of the Fluids in Immediate Surrounding The availability of soluble mineral salts varies widely from habitat to habitat. In fact, a big chunk of land in our