Morphological Changes of the Inner Surface of the Blastocoelic Wall before and during Gastrulation in the Newt, Cynops pyrrhogaster. (amphibia-newt/embryogenesis/blastocoelic wall/cell surface/morphological changes)

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Abstract
Ultrastructural observations were made of morphological changes in the inner surface of the blastocoelic wall (BW) in newt embryos during the period from morula to gastrula. A scanning EM investigation distinguished 3 phases of process formation on the inner surface of the BW. First, small blebs and filopodia were found in the morula. These then changed to large blebs in the blastula and early gastrula. They acquired lamella-like structures (lamellipodia) in the middle and late gastrula. In addition to the changes in the cell surface, cytoplasmic changes such as of the organization of the cortical microfilamentous layer (CML) were found by transmission electron microscopy (TEM). The morphological changes on the inner surface of the BW and those in the cytoplasmic ultrastructures are considered to be closely related, playing some important roles in the mechanisms of morphogenetic cell movements.

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