This is page has been made to help the younger student (from K to 12) understand some of the basics of how an embryo grows (click the movie to play).
Cartoon of Human Development
In humans, the growth of a baby inside a mother takes about 9 months.
In mice, rats and birds this growth only takes about 3 weeks.
How long does it take for cats and dogs to develop?
During this time a single cell will grow into many different cell types with different shapes and jobs to do in the body. A similar process will occur in all different embryos. In humans, many important changes occur in the first few weeks of development and much of the following 9 months is growth.
Lets now follow the growth and changes in the embryo over time.
Movie of Human Embryo Growth (this shows a human embryo growing, all images are to scale)
Movie of Limb Growth(this shows development of the human arm from bud to paddle, to hand with arm)
Movie of Mouse Embryo Growth (this shows a mouse embryo growing)
Movie of Rotating Embryo(this shows an early embryo from all angles)
All Moviesthis shows many different ways of looking in at changes in different embryos.