Retina, Biology

Assignment Help:

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.


Related Discussions:- Retina

Define the osazone test or phenylhydrazine reaction, Define the Osazone Tes...

Define the Osazone Test or Phenylhydrazine Reaction? Compounds with -CO-CHOH group form crystalline osazones with phenyl hydrazine. These osazones have characteristic shapes an

Explain energy requirement in postoperative nutritional care, Explain the E...

Explain the Energy requirement in Postoperative Nutritional Care? Adequate calorie intake is critical for successful outcome of surgery and should be provided in the form of ca

What is ammensalim, Q. What is ammensalim? The Ammensalism is the ecolo...

Q. What is ammensalim? The Ammensalism is the ecological interaction in which an individual harms another without obtaining benefit. The Ammensalism is an inharmonious (negativ

Contamination of the implant body before insertion, Contamination of the Im...

Contamination of the Implant Body before Insertion The implant may be contaminated by manufacturing error, by the operator, from non titanium instrumentation and by the bacteri

What will be the most likely explanation, If a lipid bilayer does not form ...

If a lipid bilayer does not form in a test tube of phospholipids in a liquid solvent and instead the heads join together in a circular pattern, the most likely explanation is: a

Excretion in reptiles, describe the procedure of excretion in reptiles

describe the procedure of excretion in reptiles

Growth-form and structure, Growth-form and Structure In a community the...

Growth-form and Structure In a community the number of species and size of their populations vary greatly. A community may have one or several species. The environmental factor

Fundamental aspects of protein structure, Can someone describe the fundamen...

Can someone describe the fundamental aspects of protein structure? I'm already familiar with the amino acid structure, I just don't have a clear conceptual understanding of protein

Soil-environmental components, Soil-Environmental Components The word s...

Soil-Environmental Components The word soil is derived from Latin word 'solum' meaning earthy material in which plants grow. The soil is the consolidated outer layer of the ear

Explain what it does to fluid balance, Caffeine and alcohol both block the ...

Caffeine and alcohol both block the secretion of ADH from the posterior pituitary gland. Explain what this does to fluid balance. Does it make sense to drink caffeine before an ath

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd