Vertebrate limb, Biology

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.

Posted Date: 1/29/2013 3:09:06 AM | Location : United States







Related Discussions:- Vertebrate limb, Assignment Help, Ask Question on Vertebrate limb, Get Answer, Expert's Help, Vertebrate limb Discussions

Write discussion on Vertebrate limb
Your posts are moderated
Related Questions
Define symptoms in Nervous system of pernicious anaemia? Parasthesia (numbness and tingling) occurs in fingers and toes.  Occasionally, there are objective signs of involvement

Explain about the Connecting models and data? Perhaps the most dramatic change in quantitative environmental biology in recent years has been the burgeoning progress in the dir

Using copious sterile saline irrigation This can be delivered from a sterile infusion bag in a pressure cuff or a peristaltic pump. The drills can be adequately cooled by spray

Pre-Diabetes is a condition where blood sugar level is above normal but below the value to be diagnosed as diabetes mellitus. It has been found that those people with blood sugar v

Describe the Advantages and Disadvantages of insulin pump Advantages - Insulin pumps deliver more precise amounts of insulin. This supports control over blood sugar level,

Explain the Theory or Principle for Determination of Fungal and Yeast Count? Fungi are widespread and present on food, equipments and processing and storage facilities. These a

as newly appointed food safety manager within a medium seized

DNA or RNA segment tagged with a radioactive molecule is called: 1. Vector 2. Probe 3. Clone 4. Plasmid Probe

Imaginal Discs In the holometabolous larva, there are two cell populations: (1) The larval cells that are used for the larval structures and (2) The imaginal disc and th

What Physical fitness tests examine? Physical fitness tests examine the components of physical fitness such as endurance, speed, strength, flexibility and body composition. The