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. In biological terms, the development of the human body entails growth from a one-celled zygote to an adult human being.
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 | 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. A brief treatment of embryonic development follows.
Animal embryonic development - Wikipedia
Diagram of stages of embryo development to a larval and adult stage.. In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo.Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell (spermatozoon). [1] Once fertilized, the ovum becomes a single diploid cell known as a zygote.
Embryo vs. Fetus: What’s the Difference? - Healthline
2023年4月12日 · Takeaway. With each week of pregnancy, your baby-to-be is developing in leaps and bounds. In the early stages, they are called a zygote. They then progress to an embryo, fetus, and finally, baby....
Embryo - Definition and Examples - Biology Online Dictionary
2023年8月13日 · Biology definition: An embryo is the stage of early development after fertilization up to the phase of initial organogenesis. It may also pertain to the multicellular organism itself that undergoes extensive and rapid growth and cell differentiation during the early stage of …
Definition, Development, Stages and Quiz - Biology Dictionary
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.
Embryology, Week 1 - StatPearls - NCBI Bookshelf
2023年4月17日 · Introduction. Human embryogenesis is a complicated process by which a fertilized egg develops into an embryo. During the first eight weeks of development, the conceptus shifts from a single-celled zygote into a multi-layered, multi-dimensional fetus with primitively functioning organs.
A single-cell transcriptome atlas profiles early organogenesis
2023年3月16日 · Main. Human embryogenesis finishes gastrulation by 2.5 weeks, and at 4 weeks major embryonic organ and tissue types start to differentiate 1. The transition from gastrulation to organogenesis is...
14.3: Embryonic Development - Biology LibreTexts
2022年7月30日 · Pre-Implantation Embryonic Development. Following fertilization, the zygote and its associated membranes, together referred to as the conceptus, continue to be projected toward the uterus by peristalsis and beating cilia.During its journey to the uterus, the zygote undergoes five or six rapid mitotic cell divisions.