Eye field - vertebrate eye, Finance Basics

Assignment Help:

Eye Field - Vertebrate Eye

The development of eyes starts with evagination of the lateral wall of the forebrain. one on each side, which make the optic vesicles. By vital dye staining it is established that at the open neural plate state in amphibians the presumptive material for the optic vesicle take place in the median anterior region of the neural plate. This region is termed as the eye field. After that this field gets divided into two lateral portions, one for each eye. The lens fields lie outside the neural plate in the epidermal ectoderm. In the chick the eye field has been recognized as a broad median area in the anterior part of epiblast in front of the Hensen's node at primitive streak stage. By 8-sonite stage middle part of the eye field in chick embryos has lost the capacity to make the eye, but the two lateral parts retain this capacity and each forms a complete eye. Treatment of eggs with a number of chemicals like lithium chloride choretone etc. or removal of the chorda-mesoderm from below the anterior region of neural plate avoids the division of the median eye field and a single median eye (cyclopean eye) is made instead of two lateral eyes.

The term field or more precisely the morphogenetic field of an organ may be described as the sum total of properties of the cells of that region of the embryo from which the specific organ or structure will develop. Normally, the structure concerned forms from cells in the central part of the field. However the properties to form that organ generally extend to some distance peripherally beyond the limits of the region which contributes cell for construction of the organ normally. Hence in the nonexistence of the central part of the field cells around it may make the structure.


Related Discussions:- Eye field - vertebrate eye

Mm dividend irrelevance theory, MM Dividend Irrelevance Theory Such wa...

MM Dividend Irrelevance Theory Such was advanced via Modigliani and Miller in 1961.  The theory asserts to a firm's dividend policy has no effect on cost of capital and on its

Determinants of Interest rate, What are the factors that affect the interes...

What are the factors that affect the interest rate and how?

What are the factors influencing selection of investment, Investment  Attri...

Investment  Attributes/  Factors  Influencing  Selection  of  Investment In  choosing specific  investments,  investors  would require definite  ideas  regarding  features

Determine usefulness of information in financial statements, Since 1968, Dr...

Since 1968, Dracula Limited has traded in Doncaster, South Yorkshire as a manufacturer of fancy-dress and theatrical costumes. It produces a wide range of general theatrical costum

Risk-return trade-off, Risk-Return Trade-Off Most financial decisions ...

Risk-Return Trade-Off Most financial decisions comprise alternative courses of action. The choices have different returns and risk.  As like example, must we buy a replacement

Market segmentation theory, Market Segmentation Theory This theory sta...

Market Segmentation Theory This theory states as the main investors lenders and borrowers are confined to a particular segment of the market and will not change even whether t

Accounting, iwant to learn how todo the maths for accounting

iwant to learn how todo the maths for accounting

Advantages of residual theory, Advantages of Residual Theory 1. Savin...

Advantages of Residual Theory 1. Saving on floatation costs No require to raise debt or equity capital as there is high retention of earnings that necessitates no floatat

Finance 504, What role do primary financial markets play in our economy? Wh...

What role do primary financial markets play in our economy? What role do secondary markets fill? Describe the relationship that exists between financial institutions and financial

#title.personal finance., monthly income $7,000 Monthly repay $911 what is ...

monthly income $7,000 Monthly repay $911 what is the maximum I qualify for

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