Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Uses of Plural Embryos Although the basic that trigger causes polyembryony are not fully understood, there has been no dearth of interest in exploiting supernumerary embryos.
Crustacea - Feeding and Digestion in Arthropods Branchiopods (Anacostraca) give a good instance for filter feeding mechanism. The appendages are of foliaceous type (leaf-like)
Q. Define Radiological anatomy? The borders of the mediastinum on the CXR are defined by the contrast produced by adjacent air filled lung. Postero-Anterior View It in
What is the lymphatic system? The lymphatic system is a network of specialized valved vessels that drain interstitial fluid (lymph). The lymphatic system is also responsible fo
List the four basic points to be kept in mind when advising food exchange. To develop the food exchange list points to keep in mind are: a) Group similar foods in one group.
Q. What is the osseous cavity where the pituitary gland is located? The hypophysis or pituitary gland is located in the sella turcica of the sphenoid bone (one of the bones in
CLASSIFICATION OF GENERAL DRUGS - 1 . NATURAL DRUGS - Obtained from natural sources as minerals, animals, plants & microorganism. (i) Minerals - It include
Define Absorption, Storage and Elimination of ascorbic acid? Ascorbic acid is rapidly absorbed from the intestines primarily by active transport. Simple diffusion or carrier-m
What are the types of leukocytes and how are they classified into granulocytes and agranulocytes? The types of leukocytes are monocytes, lymphocytes, neutrophils, eosinophils
Q. Which are the kinds of neurons that participate in the spinal arch reflex? Where are their cell bodies situated? In the arch reflex first a sensory neuron located in the gan
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd