Definition of Segmentation of the ovum. Meaning of Segmentation of the ovum. Synonyms of Segmentation of the ovum

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Definition of Segmentation of the ovum

Segmentation of the ovum
Segmentation Seg`men*ta"tion, n. The act or process of dividing into segments; specifically (Biol.), a self-division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. Segmentation cavity (Biol.), the cavity formed by the arrangement of the cells in segmentation or cleavage of the ovum; the cavity of the blastosphere. In the gastrula stage, the segmentation cavity in which the mesoblast is formed lies between the entoblast and ectoblast. See Illust. of Invagination. Segmentation nucleus (Biol.), the body formed by fusion of the male and female pronucleus in an impregnated ovum. See the Note under Pronucleus. Segmentation of the ovum, or Egg cleavage (Biol.), the process by which the embryos of all the higher plants and animals are derived from the germ cell. In the simplest case, that of small ova destitute of food yolk, the ovum or egg divides into two similar halves or segments (blastomeres), each of these again divides into two, and so on, thus giving rise to a mass of cells (mulberry mass, or morula), all equal and similar, from the growth and development of which the future animal is to be formed. This constitutes regular segmentation. Quite frequently, however, the equality and regularity of cleavage is interfered with by the presence of food yolk, from which results unequal segmentation. See Holoblastic, Meroblastic, Alecithal, Centrolecithal, Ectolecithal, and Ovum. Segmentation sphere (Biol.), the blastosphere, or morula. See Morula.

Meaning of Segmentation of the ovum from wikipedia

- embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell...
- The blastocoel (/ˈblæstəˌsiːl/), also spelled blastocoele and blastocele, and also called cleavage cavity, or segmentation cavity is a fluid-filled or...
- Annals and Magazine of Natural History (1920) On the structure of the ovary and ovarian ovum of Loris lydekkeri****. Quarterly Journal of Microscopic Science...
- zygote is formed from the fertilization of a normal X ovum. The resulting XX/XY zygote divides to give two cell lines: 46,XX/46,XY. The 46,XX/46,XY cell lines...
- deer. First stages of segmentation of a mammalian ovum Section of vesicular ovarian follicle of a cat, x 50 The initial stages of human embryogenesis Gilbert...
- Most of the cytoplasm is segregated into one daughter cell, which becomes the egg or ovum, while the smaller polar bodies only get a small amount of cytoplasm...
- his work on embryology. He was the first to discover the segmentation of yolk in the mammalian ovum. He enunciated the doctrine that all cells were descended...
- List of University of Edinburgh medical people is a list of notable graduates as well as non-graduates, and academic staffs of the University of Edinburgh...
- Organogenesis Outbreeding Outside markers Overdominance Overlapping clones Ovum P (peptidyl) site P element P1 P53 Palindrome Panmictic Paralogous genes...
- colours. Segmentation is outwardly incon****uous, and identifiable by the regular spacing of the pairs of legs and in the regular arrangement of skin pores...