Prenatal development (non-human)
- Prenatal development (non-human)
Prenatal development is the process in which an immature individual develops before birth. For instance, mammalian prenatal development is the process where an embryo or fetus (or "foetus") gestates during pregnancy, from fertilization until birth.
Prenatal development starts with fertilization, which marks the beginning of embryogenesis. Embryogenesis, in turn, continues in fetal development, which lasts until birth.
Fertilization
Fertilisation or fertilization (also known as conception, fecundation and syngamy), is fusion of gametes to form a new organism of the same species. In animals, the process involves a sperm fusing with an ovum, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilisation, or outside in the case of external fertilisation.
Embryogenesis
Embryogenesis is the process by which the embryo is formed and develops. It starts with the fertilization of the ovum, egg, which, after fertilization, is then called a zygote. The zygote undergoes rapid mitotic divisions, the formation of two exact genetic replicates of the original cell, with no significant growth (a process known as cleavage) and cellular differentiation, leading to development of an embryo. It occurs in both animal and plant development.
Fetal development
In mammals and other viviparous vertebrate, the embryonic stage is succeeded by the fetal stage. Often, however, the terms fetal development and the whole process of prenatal development are used in a similar sense.
Wikimedia Foundation.
2010.
Look at other dictionaries:
Prenatal development — This article is about prenatal development of human embryos and fetuses. For other species, see prenatal development (non human). For maternal changes in the prenatal period, see Maternal physiological changes in pregnancy. Prenatal or antenatal… … Wikipedia
Development economics — is a branch of economics which deals with economic aspects of the development process in low income countries. Its focus is not only on methods of promoting economic growth and structural change but also on improving the potential for the mass of … Wikipedia
Development — may refer to: Contents 1 Land use 2 Science and technology 3 Social science … Wikipedia
human behaviour — Introduction the potential and expressed capacity for physical, mental, and social activity during the phases of human life. Human beings, like other animal species, have a typical life course that consists of successive phases of… … Universalium
Human sexual activity — This article is about sexual practices (i.e., physical sexual activities). For broader aspects of sexual behavior see Human sexuality. Relationships … Wikipedia
Non-heterosexual — Gay and lesbian families, like these in a 2007 pride parade, are unlikely to label themselves non heterosexual although researchers do so for a variety of reasons.[1] Non heterosexual is an umbrella term … Wikipedia
Human penis size — is the measured length and width of the human penis. The most accurate measurement of the human penis comes from several measurements at different times, as there is natural variability in size due to arousal level, time of day, room temperature … Wikipedia
Human height — Tall redirects here. For other uses, see Tall (disambiguation). Human height is the distance from the bottom of the feet to the top of the head in a human body standing erect. When populations share genetic background and environmental factors,… … Wikipedia
Child development — For other uses, see Child development (disambiguation). Exploring Child development refers to the biological and psychological and emotional changes that occur in human beings between birth and the end of adolescence, as the individual progresses … Wikipedia
Cognitive development — Psychology Cognitive psychology Perception … Wikipedia
