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

What are the typical fauna of the taigas, What are the typical vegetation a...

What are the typical vegetation and the typical fauna of the taigas? Taiga, or the boreal forest, is characterized by coniferous trees, pine forests. There are also mosses, lic

Human diseases caused by bacteria, Q. What are some human diseases caused b...

Q. What are some human diseases caused by bacteria and what are their respective modes of transmission? The major human bacterial infections transmitted by respiratory secretio

Why do leaves change color, Why do leaves change color? Leave is the fo...

Why do leaves change color? Leave is the food factories of plants. During the spring and summer, leaves are actively making food and they are filled with chlorophyll, which giv

Explain about the glycoproteins, Explain about the Glycoproteins? Most...

Explain about the Glycoproteins? Most of the naturally occurring conjugated proteins are glycoproteins. Sugar molecules are covalently bound to them, especially those secreted

Explain the mechanical requirements of implant materials, Mechanical requir...

Mechanical requirements of implant materials Dental implant s must be able to sustain and transfer loads -It should have adequate mechanical strength in order to distribute th

Some common air pollutants, The major air pollutants are: (i)     Carbo...

The major air pollutants are: (i)     Carbon monoxide, CO (ii)   Nitrogen oxides, (NO)x (iii) Sulphur oxide, (SO)x (iv) Ground level ozone (O3) (v)   Hydrocarbons (

Coelom, Why Chordates are Schizocoelic, while other deuterostomes are enter...

Why Chordates are Schizocoelic, while other deuterostomes are enterocoelic?

What is leaf morphology, What is Leaf Morphology? Leaf Arrangemen...

What is Leaf Morphology? Leaf Arrangement : These show the different types of leaf arrangement on a twig. The point on the twig at which the leaves are attached is refer

Productivity in medical transcription, Describe several factors which affec...

Describe several factors which affect Productivity in Medical Transcription. Definition of Medical Transcription Show the various factors thataffect Productivity in Medi

Explain the anabolic phase - dietary management for burns, Explain the Anab...

Explain the Anabolic Phase - Dietary Management for Burns? During this period the patient is well hydrated and the reactions due to metabolic stress are under control. The pati

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