Search the Dictionary

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.

The process of cleavage, or segmentation, of the ovum, by which a morula is formed.

That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

A dark pure color, like the hue of a black mulberry. Mulberry mass. (Biol.) See Morula. -- Paper mulberry, a tree (Broussonetia papyrifera), related to the true mulberry, used in Polynesia for making tapa cloth by macerating and pounding the inner bark, and in China and Japan for the manufacture of paper. It is seen a…

In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with ga…

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 wi…

m cell (Physiol.), one of the cells from which the spermatozoids are developed. -- Sperm morula. (Biol.) Same as Spermosphere.