The process of cleavage, or segmentation, of the ovum, by which a morula is formed.
Defn: The process of cleavage, or segmentation, of the ovum, by which a morulais formed.
In accordance with the biogenetic law, the morula recalls the ancestral form of the Moraea, or simple colony of Protozoa.
This is called the morula (= mulberry-embryo) on account of its resemblance to a mulberry or blackberry.
It is clear that this morula reproduces for us to-day the simple structure of the multicellular animal that succeeded the unicellular amoeboid form in the early Laurentian period.
As this quantity of food-yelk fills the centre of the ovum before cleavage begins, there is no difference in this respect between the morula and the blastula.
The effect of this was to flatten the germ (the morulaand blastula) from the first, and so give, at first sight, a totally different complexion to what it has in the lowest animals.
By repeated cleavage of it a morula is formed, and from this a blastula, which changes in a very characteristic way into the greatly modified gastrula.
In the growth of this hooded gastrula we cannot sharply mark off the various stages which we distinguish successively in the bell-gastrula as morula and gastrula.
The segmentation-cells which make up the morula after the close of the palingenetic cleavage seem usually to be quite similar, and to present no differences as to size, form, and composition.
This ontogenetic stage of development which we called Morula (p.
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