morular$50475$ - ορισμός. Τι είναι το morular$50475$
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Τι (ποιος) είναι morular$50475$ - ορισμός

DIVISION OF CELLS IN THE EARLY EMBRYO
Eight-cell stage; Morula; Radial cleavage; Spiral and radial cleavage; Cleavage (embryology); Determinate and indeterminate cleavage; Indeterminate cleavage; Meroblastic; Holoblastic; Cleavage stage, ovum; Spiral cleavage; Determinate cleavage; Radial and spiral cleavage; Indeterminate and determinate cleavage; Discoidal; Discoidal cleavage; Rotational cleavage; Bilateral cleavage; 8-cell stage; Regulative cleavage; Morulas; Morulae; Morular; Morulation; Morulate; Morulates; Morulated; Morulating; Cleavage stage; Cleavage-stage embryo; Embryo compaction; Mesolecithal; Embryonic cell cleavage; Mosaic cleavage; Holoblastic cleavage; Meroblastic cleavage
  • First stages of cleavage in a fertilized mammalian egg. Semidiagrammatic.  z.p. [[Zona pellucida]]. p.gl. [[Polar bodies]]. a. Two-cell stage. b. Four-cell stage. c. Eight-cell stage. d, e. Morula stage.
  • Spiral cleavage in marine snail of the genus ''[[Trochus]]''.

Morulae         
·pl of Morula.
Morulation         
·noun The process of cleavage, or segmentation, of the ovum, by which a morula is formed.
Meroblastic         
·adj Consisting only in part of germinal matter; characterized by partial segmentation only; as, meroblastic ova, in which a portion of the yolk only undergoes fission; meroblastic segmentation;
- opposed to holoblastic.

Βικιπαίδεια

Cleavage (embryo)

In embryology, cleavage is the division of cells in the early development of the embryo, following fertilization. The zygotes of many species undergo rapid cell cycles with no significant overall growth, producing a cluster of cells the same size as the original zygote. The different cells derived from cleavage are called blastomeres and form a compact mass called the morula. Cleavage ends with the formation of the blastula, or of the blastocyst in mammals.

Depending mostly on the concentration of yolk in the egg, the cleavage can be holoblastic (total or entire cleavage) or meroblastic (partial cleavage). The pole of the egg with the highest concentration of yolk is referred to as the vegetal pole while the opposite is referred to as the animal pole.

Cleavage differs from other forms of cell division in that it increases the number of cells and nuclear mass without increasing the cytoplasmic mass. This means that with each successive subdivision, there is roughly half the cytoplasm in each daughter cell than before that division, and thus the ratio of nuclear to cytoplasmic material increases.