Embryology

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Embryology is the study of the development of an embryo. An embryo is defined as any organism in an early stage well before birth or hatching, or in plants, before germination occurs. Embryology refers to the study of the development immediately after conception,... Viac o knihe

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O knihe

Embryology is the study of the development of an embryo. An embryo is defined as any organism in an early stage well before birth or hatching, or in plants, before germination occurs. Embryology refers to the study of the development immediately after conception, and therefore the fertilized egg cell (zygote) and its differentiation into tissues and organs during the first 8 weeks, after 8 weeks the embryo becomes a fetus. After cleavage, the dividing cells, or morula, becomes a hollow ball, or blastula, which develops a hole or pore at one end. In bilateral animals, the blastula develops in one of two ways that divides the whole animal kingdom into two halves (see: Embryological origins of the mouth and anus). If in the blastula the first pore (blastopore) becomes the mouth of the animal, it is a protostome; if the first pore becomes the anus then it is a deuterostome. The protostomes include most invertebrate animals, such as insects, worms and molluscs, while the deuterostomes includes more advanced animals including the vertebrates. In due course, the blastula changes into a more differentiated structure called the gastrula.

  • Vydavateľstvo: Alphascript Publishing
  • Formát: Paperback
  • Jazyk:
  • ISBN: 9786130094409

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