Morula - ορισμός. Τι είναι το Morula
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Τι (ποιος) είναι Morula - 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]]''.

Morula         
·noun The sphere or globular mass of cells (blastomeres), formed by the clevage of the ovum or egg in the first stages of its development;
- called also mulberry mass, segmentation sphere, and blastosphere. ·see Segmentation.
morula         
['m?:r(j)?l?]
¦ noun (plural morulae -li:) Embryology a solid ball of cells resulting from division of a fertilized ovum, and from which a blastula is formed.
Origin
C19: mod. L., dimin. of L. morum 'mulberry'.
Morula         
A morula (Latin, morus: mulberry) is an early-stage embryo consisting of a solid ball of cells called blastomeres, contained within the zona pellucida. The blastomeres are the daughter cells of the zygote, and in the human by day 4 after fertilisation the blastomeres number from 16–32 and the ball of cells is called the morula.

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.