Definition of Egg cleavage. Meaning of Egg cleavage. Synonyms of Egg cleavage
Here you will find one or more explanations in English for the word Egg cleavage. Also in the bottom left of the page several parts of wikipedia pages related to the word Egg cleavage and, of course, Egg cleavage synonyms and on the right images related to the word Egg cleavage.
Definition of Egg cleavage
Egg cleavageSegmentation 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
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.
Meaning of Egg cleavage from wikipedia
- of yolk in the egg
, the cleavage
can be holoblastic
(total or entire cleavage
) or meroblastic
). The pole of the egg
with the highest...
- so the cleavage
of the egg
cell cuts through
of fairly similar
sizes. In sponges
the dividing eggs
- zygote. In holoblastic eggs
the first cleavage always occurs along
the vegetal-animal axis of the egg
, and the second cleavage
- In cell biology, the cleavage furrow
is the indentation
of the cell's surface
, by which animal
and some algal
the fertilization, the cleavage
of the embryo leads
to the formation
of the germinal
disc. As food, the chicken egg
yolk is a major source
- cleavage), bilateral
(see: Bilateral cleavage
), or rotational
(see: Rotational cleavage
). In holoblastic cleavage
the entire egg
- Many arthropod eggs
are centrolecithal. During
cytokinesis, centrolecithal zygotes undergo meroblastic cleavage
the cleavage plane extends
- cytokinesis. Coeloblastula
is the next stage
this radial cleavaging
. In mammals, because
the isolecithal cells
have only a...
and sperm). The development
of a zygote
into a multicellular embryo proceeds through
stages, often divided
at one pole of the egg separate
from the developing
embryo. This type of egg undergoes discoidal meroblastic cleavage
yolk is not incorporated...
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