Embryo - Wikipedia
An embryo is the initial stage of development for a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sperm cell.
Embryo vs. Fetus: What’s the Difference? - Healthline
2023年4月12日 · During each week of pregnancy, your baby is growing. Here’s a look at what medical terms like embryo and fetus mean in terms of development.
Embryo | Human & Animal Characteristics | Britannica
2024年10月15日 · Embryo, 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 seventh week following conception; from the eighth week the unborn child is called a fetus.
Embryo Definition & Meaning - Merriam-Webster
: 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 within a seed. : a beginning or undeveloped stageused especially in the …
Embryo - Definition, Development, Stages and Quiz | Biology ...
2017年7月6日 · An embryo refers to the early developmental stage of eukaryotic organisms following the fertilization of an egg (derived from a female) by sperm (derived from a male) as a method of sexual reproduction.
What is the difference between an embryo, a fetus, and a baby?
2021年8月25日 · The embryo (and later the fetus) is reliant on the pregnant person’s blood (which carry oxygen and nutrients) through the placenta. The placenta is an organ specially formed from the blastocyst cell layer called the trophectoderm (3).
Embryo - Definition and Examples - Biology Online Dictionary
2023年8月13日 · An embryo refers to the early developmental stage of a multicellular organism that follows fertilization. This stage represents a crucial juncture in the life cycle, transitioning from a single fertilized cell into a complex organism with specialized tissues and structures.
Stages of Fetal Development - Stages of Fetal Development ...
The next stage in development is the embryo, which develops within the amniotic sac, under the lining of the uterus on one side. This stage is characterized by the formation of most internal organs and external body structures.
Human embryonic development - Wikipedia
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 differentiation of the embryo that occurs during the early stages of development.
Embryonic Development - Embryology
4 天之前 · This page shows some key events of human development during the embryonic period of the first eight weeks (weeks 1 - 8) following fertilization. This period is also considered the organogenic period, when most organs within the embryo have begun to form.