Neurulation in amphibians, Biology

Assignment Help:

Neurulation in Amphibians

The first step in the neurulation process is the flattening and thickening of dorsal ectoderm to form neural plate. The plate of cells are different from the rest of ectoderm cells in that they have changed shape and appear more columnar. The edges of the neural plate after that rise above along the rest of the neural plate to form neural folds. The neural folds are now found together the two flanks of a central depression called neural groove. The neural groove extends along the entire middorsal line of the embryo. Eventually the neural folds meet in the middle above the deepening neural groove and fuse to make the neural tube. At the time of rolling of neural plate to make the neural tube, the neuroepithelial cells at the lateral folds of the neural plate develop constrictions at their apical edges.

This alterations the shape of columnar epithelial cells into pyramidal cones. As the surface area of apical end of neural epithelial cells turns into smaller relative to the basal surface, the rolling up of the neural plate and formation of neural tube occurs. Along with the fusion of neural folds along the middorsal line, the neural ectoderm separates from epidermal ectoderm that now covers the neural tube and completely surrounds the embryo. The change in the shape of cells in the neural tube results in the regionalisation of neural tube. In the cephalic end, i.e. the end which will differentiate into brain, the wall of the tube is broad and thick and a series of swellings and constrictions develop which define the several divisions of brain. Caudally, towards the posterior end, the tube is simple and narrow extending into the tail.


Related Discussions:- Neurulation in amphibians

Degradation of fats, Q. Explain Degradation of Fats? Fats are the este...

Q. Explain Degradation of Fats? Fats are the esters of glycerol and fatty acids and are called as 'glycerides'. Fats are susceptable to hydrolysis, oxidation and other che

Odyssey, how does odysseus get the dead to talk to him?

how does odysseus get the dead to talk to him?

Explain about the phosphorus - macro minerals, Explain about the Phosphorus...

Explain about the Phosphorus - Macro Minerals? Phosphorus is the second most abundant element in the human body, comprising 30% of the total mineral content. An adult human bod

Zoonotic diseases-yellow fever, Yellow fever Yellow fever also known a...

Yellow fever Yellow fever also known as Black Vomit and American plaque is a viral disease primarily of monkeys and transmitted to man by female Aedes mosquitoes. It is caused

Bioenergetics, role of bioenergetics in our body

role of bioenergetics in our body

Functions of testosterone, FUNCTION S OF TESTOSTERONE - (a) It stimula...

FUNCTION S OF TESTOSTERONE - (a) It stimulates the growth and development of male secondary sex organs like the seminal vesicles, prostate and penis. It also helps to maintain

Explain about dietary management, Q. Explain about Dietary Management? ...

Q. Explain about Dietary Management? Treatment for gout often include a diet of lower purine intake. Indeed, about one third of the body's uric acid can be attributed to diet.

Classification of pollution sources, The man-made sources of air pollution ...

The man-made sources of air pollution are broadly categorized into three: Point or stationary sources:  it includes such sources which pollute at particular. Pollutants from

Brasseler endo extractor tube-endodontics principles, Brasseler Endo Extrac...

Brasseler Endo Extractor tube Insert H file buccally and lingually and remove silver by friction.If I can't remove use solvent to desolve cement If the tip of silver not appear

Cell theory, Cell Theory The term cell was first used by an English cyt...

Cell Theory The term cell was first used by an English cytologist, Robert Hooke (1665) not for unit protoplasmic masses, but for the well defined and empty compartments, he obs

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