Human embryonic development or human embryogenesis is the development and formation of the human embryo. It is characterised by the processes of cell division and cellular …

The embryonic stage lasts from about the third week of pregnancy until the end of the eighth week of pregnancy. The blastocyst begins to take on distinct human characteristics.

A developing human is referred to as an embryo during weeks 3–8, and a fetus from the ninth week of gestation until birth. In this section, we’ll cover the pre-embryonic and embryonic …

Clicking the Carnegie stage numbers opens a page dedicated to describing that single stage and the associated developmental events. This page shows some key events of human …

Prenatal development, the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth. This process can be divided into three distinct …

May 12, 2025 · This diagram of human embryonic and fetal development offers a detailed look at the stages from fertilization to 20 weeks. It serves as a valuable tool for understanding …

Jul 23, 2025 · The human embryo represents the initial phase of human development, a period of remarkable transformation from a single cell into a complex organism. This stage …

Aug 3, 2023 · Human embryogenesis refers to the development and formation of the human embryo. It encompasses the first eight weeks of development after fertilization, in which a …

The inner cells in the thickened area develop into the embryo, and the outer cells burrow into the wall of the uterus and develop into the placenta. The placenta produces several hormones that …

Visit the Virtual Human Embryo project at the Endowment for Human Development site to step through an interactive that shows the stages of embryo development, including micrographs …