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. Under which form is nitrogen fixed by living beings? The Most living beings can't use molecular nitrogen to obtain nitrogen atoms. The Producers fix nitrogen primarily from

1. Define each term and give an example of an application that uses the following: a. Biocompatible material b. Biodegradable material c. Biomimetic

Q. Water has key participation in organic reactions. What are examples of two types of organic reactions in which water is respectively incorporated or liberated in the products of

#affinities of ctenophora with platyhelmintheson..

Define Procedure for Testing the Presence of Starch in Milk 1. Take 1 ml of milk sample in a test tube. 2. Add few drops of iodine solution. (2.5 gm of iodine is dissolved i

Q. How does synaptic transmission between neurons take place? The propagation of the action potential along the axon reaches the region immediately anterior to the presynaptic

In designing an experiment to find out whether light is required for photosynthesis    (a) what is the principle of the design    (b) what control would you use?

Emergency Room Management Patient may needs incubation and ventilatory support till such time that patient is able to breathe normally. In some cases: patient is admini

how to explain the structure and function of the organelle

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