Human embryonic development, or human embryogenesis from zygota to gastrula. Vector medical illustration
Chicken egg fertility identification. fertilized eggs contain blastoderm, while unfertilized eggs contain blastodisc.
Blastula. hollow sphere of cells, surrounding a cavity blastocoele. stage of segmentation of a fertilized ovum. Human embryonic development. Vector illustration
The process of gastrulation. Remnant of blastocoel, invaginating, endoderm, ectoderm, blastopore, archenteron stage of segmentation of a fertilized ovum. Human embryonic development. Vector