Embriooni

Embriooni is a Finnish word that translates to "embryo" in English. It refers to the early stage of development of a multicellular organism. In humans and other mammals, the embryonic period begins after fertilization, when a zygote is formed, and lasts until the end of the eighth week of gestation. During this time, the fundamental structures of the body are formed, including organs and body parts. The developing organism at this stage is called an embryo.

The development of an embryo is a complex and highly regulated process. It involves cell division, differentiation, and morphogenesis. Following fertilization, the zygote undergoes rapid cell division, forming a blastocyst. This blastocyst then implants into the uterine wall, marking the beginning of embryonic development. The three primary germ layers – ectoderm, mesoderm, and endoderm – form, and these layers give rise to all the tissues and organs of the body.

The embryonic period is a critical time for development, and it is particularly sensitive to environmental influences. Exposure to certain substances or conditions can lead to developmental abnormalities. After the eighth week of gestation, the embryo is typically referred to as a fetus, and development continues until birth. The term "embriooni" thus encompasses this crucial early phase of life, characterized by rapid growth and the establishment of the basic body plan.