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The Female Germ page
The Male Germ
The Journey of the Spermatozoa
17 other sections not shown
adapted adult amphibia ancestors animals appear become begin biological biologists birth blood-vessels body brain called cavity chance chorionic villi chromo chromosomes complicated containing cord corona radiata corpus luteum cytoplasm divides ectoderm egg-cell embryo embryonic disc endoderm epididymis external eyes factors Fallopian tubes female fertilisation fish foetus follicle forty-eight chromosomes frog function germ-cells give gland grafted granules growing head heredity hormone human embryo individual influence kidneys layer liquid living male cell mammals mass maternal blood maturation membrane millions mother mucous nature nerve-cells neural groove newt embryo nine months nourishment nucleus nutritive organiser organism ovary ovocyte pair placenta pregnancy primitive streak produce Prolan protoplasm reproductive cells reptiles resemble second month secretion sexual reproduction skin species sperm-cell spermatic spermatozoa stage substances surface tail takes place tion twenty-four chromosomes twin umbilical uterine wall uterus vesicles week whole woman womb yolk zona pellucida