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 …

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 …

: 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 …

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.

Mar 19, 2024 · Fetal Development Within 24 hours after fertilization, the egg that will become your baby rapidly divides into many cells. By the ninth week of pregnancy, the embryo develops …

embryo An organism in its earliest stages of development, especially before it has reached a stage at which it can be distinguished from other species. The human embryo is so called up …

Oct 14, 2025 · An embryo is the early stage of development and lasts from week five to week 10 of pregnancy. A fetus is the later stage of development and lasts from the end of week 10 until …

Use the stage number links to images and information about each specific stage of human development over the first 8 weeks. The links below give a broad overview of developmental …

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 …

Drs. Kevin and Kathleen Doody, the husband-and-wife co-founders of CARE Fertility, and have firsthand experience with infertility, so they can relate to families in Bedford and Fort Worth, …