The somatic layer will convert into musculature of body wall and here ribs will develop. The endodermal lining will develop into skin. The splanchnic layer of lateral plate will develop into musculature of wall of GIT. The endodermal lining will develop into GIT. In further development, folding of trilaminar disk takes place. With time, this intraembryonic coelom eventually becomes continuous with extraembryonic coelom. The cavity, which is developed between the two layers is called intraembryonic coelom. The plate related with ectoderm is called somatic layer while the layer related with endoderm is called splanchnic or visceral layer. The lateral plate develops cavities and is divided into two layers. Next to the paraxial mesoderm, intermediate mesoderm is present. KGMC From 3 rd week onwards, the medial most part of intraembryonic mesoderm (adjacent to neural tube and notochord) proliferates and become swollen and larger in size, which is then called paraxial mesoderm. Splanchnic layer/ Visceral layer/ Inner layer develops adjacent to hypoblast Laterally, intraembryonic mesoderm is in contact with extraembryonic mesoderm. Somatic layer/ Parietal layer/ Outer layer develops adjacent to cytotrophoblast 2. Extraembryonic mesoderm form two layers 1.
NAJEEB LECTURE NOTES BY FATIMA HAIDER OVERVIEW Intraembryonic mesoderm sandwiched between ectoderm and endoderm in trilaminar disk Extraembryonic mesoderm - Mesoderm lying outside the embryo proper and involved in the formation of amnion, chorion, yolk sac, and body stalk.
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