Apical ectodermal ridge or aer, Biology

Apical Ectodermal Ridge (AER)

We have described earlier that the AER persists at the tip until the last phalangeal cartilage begins differentiation. The following experiments have demonstrated that the AER is formed and then maintained under the influence of limb mesoderm:

1) When limb mesoderm is grafted under the ectoderm of any region of an early embryo it induces the formation of an AER in the overlying ectoderm.

2) When limb bud mesoderm is removed or separated from the AER by a barrier (e.g. a thin sheet of mica) or is replaced by non-limb mesoderm the AER flattens and disappears. It is believed that limb mesoderm secretes some substance called AER Maintenance Factor (AER MF) that sustains the integrity of the AER.

 

Posted Date: 1/29/2013 6:06:42 AM | Location : United States







Related Discussions:- Apical ectodermal ridge or aer, Assignment Help, Ask Question on Apical ectodermal ridge or aer, Get Answer, Expert's Help, Apical ectodermal ridge or aer Discussions

Write discussion on Apical ectodermal ridge or aer
Your posts are moderated
Related Questions
Q. Besides the pancreatic juice in the intestine there is the releasing of the enteric juice that contains digestive enzymes too. What are these enzymes and which type of molecule

In the typical Western diet approximately 80-140 G triglyceride and 0.5-1.5 G cholesterol are eaten daily. Following digestion, absorption and reesterification, triglyceride and c

The Different systems of the body are: 1) Nervous System 2) Respiratory System 3) Cardiovascular System 4) Neurological and Sensory System 5) Gastrointestinal Syste

Mixture of gasoline and air is used as fuel in internal combustion engine. It is highly compressed and then ignited. 1.      The process involves four strokes : 2.      The f

Mountains and their forest ecosystems are regarded as the water towers of the world. A good example is the extraordinarily massive Himalayan Mountains which have shaped the climate

a) What is 'vaso-constriction'? b) What are the effects of vaso-constriction in the skin?   a) Vaso-constriction is the reduce in diameter of small arterioles an

Characteristics of phylum porifera

extracellular signals and their characteristics

Q. What are introns, and how do they affect the processing of genetic information? Introns, a feature of eukaryotic DNA, are intervening stretches of DNA lying between the exon

Define the lens transparency in metabolism of lens. Lens Transparency: a. Transparency depends on avoidance of large transitions of refractory index. This is in other wor