A newly developing human is typically referred to as an embryo until the ninth week after conception, when it is then referred to as a fetus. In other multicellular organisms, the word embryo can be used …

Dec 7, 2025 · Fetal development from conception to term, including a gestational age calculator from the estimated due date and a fetal development critical periods chart.

: an animal in the early stages of development that are marked by cleavage, the laying down of the basic tissues, and the formation of primitive organs and organ systems compare fetus. : a tiny young plant …

Dec 28, 2025 · An embryo is the early developmental stage of an animal while it is in the egg or within the uterus of the mother. In humans the term is applied to the unborn child until the end of the …

Aug 13, 2023 · An embryo is a newly fertilized egg (zygote) up till the eighth week of development as it transforms through the morula, blastula, gastrula, and organogenesis stages.

Jul 21, 2025 · An embryo represents the initial stage of development in a multicellular organism. This period is characterized by rapid cell division and the establishment of the basic body plan.

An embryo is the earliest stage of human development. It forms when an egg and a sperm meet, and fertilization happens. At that point, a single cell is created. That cell already contains all the genetic …

In humans, the embryo is defined as the organism from the time of implantation in the uterus until about the eighth week, while the fetus is the stage from this time until birth.

The embryo, which takes the shape of an oval-shaped disc, forms an indentation called the primitive streak along the dorsal surface of the epiblast. A node at the caudal or “tail” end of the primitive …

Aug 5, 2025 · Embryo development is a complex process that begins with fertilisation, followed by cleavage, morula, blastocyst, and organogenesis. The embryonic stages in the human embryo are …