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blastula    
n. 胞胚

胞胚

blastula
n 1: early stage of an embryo produced by cleavage of an ovum; a
liquid-filled sphere whose wall is composed of a single
layer of cells; during this stage (about eight days after
fertilization) implantation in the wall of the uterus
occurs [synonym: {blastula}, {blastosphere}]


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  • Blastulation - Wikipedia
    A Morula and B cross section of a blastula displaying the blastocoel and blastoderm of early animal embryonic development Blastulation is the stage in early animal embryonic development that produces the blastula In mammalian development, a blastula develops into the blastocyst with a differentiated inner cell mass and an outer trophectoderm
  • Blastula | Embryonic Development, Cell Division Gastrulation - Britannica
    blastula, hollow sphere of cells, or blastomeres, produced during the development of an embryo by repeated cleavage of a fertilized egg The cells of the blastula form an epithelial (covering) layer, called the blastoderm, enclosing a fluid-filled cavity, the blastocoel After the blastula develops, it undergoes transition to the gastrula (q v ), a process called gastrulation In organisms
  • 43. 5B: Cleavage, the Blastula Stage, and Gastrulation
    Cleavage and Blastula Stage The development of multi-cellular organisms begins from a single-celled zygote, which undergoes rapid cell division to form the blastula The rapid, multiple rounds of cell division are termed cleavage After the cleavage has produced over 100 cells, the embryo is called a blastula
  • What Is the Blastula? Definition, Structure Types
    A blastula is a hollow ball of cells that forms early in animal development, just after a fertilized egg undergoes its first rounds of cell division It represents a key milestone: the moment a single-celled egg has become a multicellular structure with a defined architecture, ready for the dramatic reshaping that builds an actual body In most animals, the blastula consists of an outer layer
  • Blastula - an overview | ScienceDirect Topics
    1 Introduction The blastula is the first identifiable stage of early embryo development that is common to many animals, and consists generally of a hollow epithelial layer enclosing a fluid-filled cavity: the blastocoel Since the seminal work of Wolpert and Gustafson [1], blastocoel emergence is classically described in textbooks as the outcome of cell cleavage patterning Yet this canonical
  • Blastula - Definition and Examples - Biology Online Dictionary
    The blastula is an early embryonic stage characterized by a hollow, spherical structure that occurs during the development of many animal species
  • BLASTULA Definition Meaning - Merriam-Webster
    The meaning of BLASTULA is an early metazoan embryo typically having the form of a hollow fluid-filled rounded cavity bounded by a single layer of cells
  • Midblastula - Wikipedia
    In developmental biology, midblastula or midblastula transition (MBT) occurs during the blastula stage of embryonic development in non-mammals During this stage, the embryo is referred to as a blastula The series of changes to the blastula that characterize the midblastula transition include activation of zygotic gene transcription, slowing of the cell cycle, increased asynchrony in cell
  • Blastula Definition Structure and Formation - Vedantu
    Learn the blastula definition structure and formation in early embryonic development with clear explanation and diagram guidance for exams
  • Blastula - an overview | ScienceDirect Topics
    Blastula A hollow sphere of cells surrounding a fluid-filled cavity Many animals produce a blastula stage embryo early in development, prior to gastrulation Cambrian The first geologic period of the Paleozoic era, lasting from ~542 to 485 million years ago Most modern animal lineages have a fossil record that extends to this period Cell





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