![]() ![]() In protostomes, the developing zygote undergoes spiral cleavage, a process in which the cells divide at a 45° angle to one another due to a realignment of the mitotic spindle. Origin of mesoderm: pouches off gut (endoderm)Ĭleavage pattern refers to the process of cell division from one fertilized cell, the zygote, into hundreds of cells, the embryo.Origin of mesoderm arises from mesentoblast (4d cells).These developmental features are different in the two groups and can be summarized as follows: Origin of mesoderm (the "middle" embryonic tissue layer between ectoderm and endoderm that forms various structures such as muscles and skeleton). ![]()
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