embryo development

Embryo development begins when a sperm fertilizes an egg, forming a single fertilized cell called a zygote. This zygote divides multiple times, creating a cluster of cells that travel to the uterus. Over time, these cells differentiate into specific types, forming the early structures of the body, such as the brain, heart, and limbs. The embryo grows rapidly, with organ systems developing and becoming more complex. By the end of the first trimester, the embryo transitions into a fetus, with recognizable features and functional organs, marking the continuation of prenatal development toward birth.