blastula. the cells surrounding a cavity blastocoele.

anatomy biology birth blastocoele blastomeres blastula cage cavity cell cells child conceiving developing development division egg embryo embryology embryonic female fertility fertilized fetus follicle genes genetic gynecology health human illustration infertility insemination medical medicine microscopic natural nhuman nucleus oocyte ovary ovulation ovum penetrate pregnancy rendering reproduction reproductive seed segmentation stage surrounding the treatment unnatural zygote