<P> In animals , the development of the zygote into an embryo proceeds through specific recognizable stages of blastula , gastrula , and organogenesis . The blastula stage typically features a fluid - filled cavity , the blastocoel , surrounded by a sphere or sheet of cells , also called blastomeres . In a placental mammal , an ovum is fertilized in a fallopian tube through which it travels into the uterus . An embryo is called a fetus at a more advanced stage of development and up until birth or hatching . In humans , this is from the eleventh week of gestation . However , animals which develop in eggs outside the mother 's body , are usually referred to as embryos throughout development ; e.g. one would refer to a chick embryo , not a `` chick fetus '' , even at later stages . </P>
<P> In animals , the development of the zygote into an embryo proceeds through specific recognizable stages of blastula , gastrula , and organogenesis . The blastula stage typically features a fluid - filled cavity , the blastocoel , surrounded by a sphere or sheet of cells , also called blastomeres . In a placental mammal , an ovum is fertilized in a fallopian tube through which it travels into the uterus . An embryo is called a fetus at a more advanced stage of development and up until birth or hatching . In humans , this is from the eleventh week of gestation . However , animals which develop in eggs outside the mother 's body , are usually referred to as embryos throughout development ; e.g. one would refer to a chick embryo , not a `` chick fetus '' , even at later stages . </P>
where does the young ones develop in humans
where does the young ones develop in humans
uterus
uterus