All develop from mesoderm except
Correct Answer: Enamel
Description: In all bilaterian animals, the mesoderm is one of the three primary germ layers in the very early embryo. The other two layers are the ectoderm (outside layer) and endoderm (inside layer), with the mesoderm as the middle layer between them. The mesoderm forms mesencyme, mesothelium, non-epithelial blood cells and coelomocytes. Mesothelium lines coeloms. Mesoderm forms the muscles in a process known as myogenesis, septa (cross-wise paitions) and mesenteries (length-wise paitions); and forms pa of the gonads (the rest being the gametes).Myogenesis is specifically a function of mesemchyme. The mesoderm differentiates from the rest of the embryo through inercellular signalling, after which the mesoderm is polarized by an organizng center. The position of the organizing center is in turn determined by the regions in which beta-catenin is protected from degradation by GSK-3. Beta-catenin acts as a co-factor that alters the activity of the transcription factor tcf-3 from repressing to activating, which initiates the synthesis of gene products critical for mesoderm differentiation and gastrulation. Fuhermore, mesoderm has the capability to induce the growth of other structures, such as the neural plate, the precursor to the nervous system. Ref - wikipedia.org
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