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!
Regression of Primitive Streak
As the inward migration of cells by the primitive streak ends progressively along its anterior to posterior regions the streak slowly regresses in the same direction. As the streak shortens the Hensen's Node that forms its anterior end, also moves in a posterior direction at the same time, the presumptive notochordal cells still remaining in the epiblast migrate inward through the posteriorly moving node adding to the length of the notochord. So the regressing streak leaves behind in its path the dorsal axis of the embryo represented by the posteriorly lengthening notochord. By the time the streak disappears and the Hensen's Node arrives at the last position at the posterior border of area pellucida all the presumptive endodermal and mesodermal cells have left the epiblast that now contains only the ectodermal cells. Regression of streak starts after about 22 hours of incubation and is completed in the next about 20 hours. It should be noted that not like amphibian gastrulation differentiation of axial structures and some organs like neural tube, somites, foregut, heart, takes place cephalocaudally along with the progress of later stages of gastrulation in chick embryos.
Define Modification of Carbohydrate Intake for Specific Disorder? In our daily diet almost 60-7096' of energy is contributed by carbohydrates. Majority of them are comprised of
In some protozoans, food is always ingested at the same place on cell surface, cytostome (cell mouth). Undigested food is removed at a cytoproct, or cell anus. All of this is simil
Explain about Listeria monocytogenes infection Listeria monocytogenes is a gram-positive, motile, non-spore forming rod. It is widely distributed in nature and can be found on
Neuron A is a healthy neuron with all the usual ion channels. When at rest with a membrane voltage of R millivolts, neuron A produces no action potentials. The voltage thres
Q. What is Tyrosinemia? There are two forms of hereditary tyrosinemia. They are tyrosinemia Type I and tyrosinemia Type II. Type I was thought to be due to a deficiency of para
What are the main human degenerative diseases? The main human degenerative diseases are separated into three groups: cardiovascular diseases, neoplastic diseases and degenerat
It is mostly spread by sexual contact, blood transfers and from HIV infected mother to child.
What are the possible effects on the fetus if, during pregnancy, the mother (a) smokes, (b) catches rubella? a) Smoking during pregnancy can lead to an underwe
When the R-wave in the lateral precordial leads is less than 10 mm the sensitivity of ST depression is very low if 1 mm of ST depression is used as a standard. The corrected ST for
Q. Define Primary and Somatic Sensory Area? Primary Sensory Area - Located in postcentral gyrus in parietal lobes (just posterior to central sulcus). Neurons here receive info
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd