Gastrula — Free Biology Illustration

Biology

Gastrula

Cross-sectional embryology diagram of a gastrula shown as a rounded to spherical early embryo with a smooth outer surface made of tightly packed cells. One side is folded inward by invagination, creating an asymmetrical cup-like internal pocket or developing archenteron. A clearly visible opening on the indented side leads into this cavity, representing the blastopore. The embryo appears hollow or partially hollow overall, with layered cellular organization visible around the surface, ranging from double-layered to multilayered and in some depictions emphasized as three distinct tissue layers surrounding the cavity.

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