Archive image from page 62 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of' entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite i


Archive image from page 62 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of' entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo rapid proliferation. Some of the newly formed scleratogenous cells invade the myoccele ; others migrate towards the notochord ; finally, the scleratogenous cells separate from the remainder of the somite, and as they increase in number they migrate along the sides of


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