Vertebrate limb, Biology

Assignment Help:

Vertebrate Limb

Earlier we know that how a series of sequential and coordinated interactions between different cell groups and tissues carry about the construction of a complex organ, the vertebrate eye. In this we will study the development of other complex organ, the vertebrate limb. The paired limbs of all tetrapod vertebrates are made on a common basic pattern, develop in similar manner from cells derived from identical sources in the embryo and, hence, they are all homologous structures. An extremely large number of descriptive and experimental studies have been done on development in vertebrates throughout the present century.

At first the work was done mostly on amphibian embryos but later the chick has been chosen for, among other reasons, the chick embryos are large, easily accessible and obtainable throughout the year. As recently much experimental work has been done on the development of wing of chick embryos. The wing bud is comparatively a large structure and can be manipulated in several ways by the investigator. Portions of the bud can be cut out and their development studied through grafting them in the same or different embryos or on chorioallantoic membrane of older chick embryos. Its mesodermal and ectodermal components can be separated from each other by treatment along with some chemicals like trypsin, EDTA etc or microsurgery and then they can be reassembled readily in different combinations. The two components of such type of synthesized buds can be from the same or different limb types, from embryos of similar or different stages, of the same or different species. The development of such types of combinations can be studied by grafting them on embryos or chorioallantoic membrane or culturing them in vitro. Much of our understanding about the mechanisms involved in limb development has come from investigations on such studies on chick embryos.


Related Discussions:- Vertebrate limb

Photometer-radiation instrument, Photometer Photometer (Figure shown be...

Photometer Photometer (Figure shown below) measures the intensity of light. The metallic plate A is a photocell which emits electrons from its surface when light of sufficient

Patterns of cleavage, P A TTERNS OF CLEAVAGE - Patterns of cleavage d...

P A TTERNS OF CLEAVAGE - Patterns of cleavage depends upon amount of yolk & distribution of yolk. These are following types - 1 .       RADIAL CLEAVAGE PATTERN -

Connective tissue, how connective tissues are like an estuary

how connective tissues are like an estuary

What are the role of mr, MR means medical representative. Medical rep has t...

MR means medical representative. Medical rep has to sell products of pharma companies or drug manufacturers. He has to go to doctors and medical shops to sell drugs and promote dru

Tissue, how does the structure of epithelial tissue allows it to fulfil its...

how does the structure of epithelial tissue allows it to fulfil its function

Explain scombroid poisoning, Q. Explain scombroid poisoning? Ingestion ...

Q. Explain scombroid poisoning? Ingestion of improperly handled and stored seafood (yellow-fin tuna, skipjack, bonit and mackerel) causes scombroid poisoning. Maitoxin has been

Zoology, Give the salient features of phylum protozoa

Give the salient features of phylum protozoa

Describe shunts, Q. Describe Shunts? Detection, localization and quanti...

Q. Describe Shunts? Detection, localization and quantification of intracardiac shunts are one of the most important exercises in cardiac catheterization. In most cases a prelim

Describe an experiment to test rna, describe an experiment to test if RNA ...

describe an experiment to test if RNA is a transcript of DNA

Define hormonal imbalance as a factor for obesity, Define Hormonal imbalanc...

Define Hormonal imbalance as a factor for obesity? Certain diseases associated with secretion of hormones, e.g., hypothyroidism, hypogonadism and Cushing's syndrome exhibit obe

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