cleavage

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cleavage

 [klēv´ij]
1. division into distinct parts.
2. the early successive splitting of a fertilized ovum (zygote) into smaller cells (blastomeres) by mitosis.

cleav·age

(klēv'ij),
1.
See also: cleavage division.
See also: Langer lines, tension lines. Synonym(s): intermammary cleft
2. Series of mitotic cell divisions occurring in the oocyte immediately following its fertilization.
See also: cleavage division.
See also: Langer lines, tension lines. Synonym(s): segmentation (2)
3. Splitting of a complex molecule into two or more simpler molecules.
See also: Langer lines, tension lines. Synonym(s): scission (2)
4. Linear clefts in the skin indicating extrinsic stresses being applied in that area.
See also: Langer lines, tension lines.
5. The tendency of a crystal to break along a preferred direction or plane.

cleavage

(klē′vĭj)
n.
1. Embryology
a. The series of mitotic cell divisions that produces a blastula from a fertilized ovum. It is the basis of the multicellularity of complex organisms. Also called segmentation.
b. Any single cell division in such a series.
2. Chemistry The splitting of a complex molecule, such as a polysaccharide, into simpler molecules.

cleavage

Embryology
The mitotic divisions of a zygote (fertilised egg) to form a blastomere (cleavage cells).
 
Vox populi
The act of splitting or cleaving.

cleav·age

(klēv'ăj)
1. Series of mitotic cell divisions occurring in the oocyte immediately after its fertilization.
See also: cleavage division
2. Splitting of a complex molecule into two or more simpler molecules.
Synonym(s): scission (2) .
3. Linear clefts in the skin indicating the direction of the fibers in the dermis.
See also: cleavage lines

cleavage

1. The process of splitting, especially the repeated stages of cell division that produce a BLASTULA from an ovum that has been fertilized by a spermatozoon.
2. The breaking down of a complex molecule into smaller parts.
3. The vertical furrow between a woman's breasts visible when low-cut garments are worn.
Cleavageclick for a larger image
Fig. 109 Cleavage . Radial and spiral cleavage.

cleavage

the division of the cytoplasm during nuclear division (see MEIOSIS, MITOSIS following FERTILIZATION of the egg to form the ZYGOTE. Holoblastic cleavage occurs in animals where there is little yolk, and here the entire zygote is involved; meroblastic cleavage occurs where the yolky part of the zygote fails to divide, only part of the zygote undergoing cleavage. BILATERAL CLEAVAGE gives rise to a bilaterally symmetrical arrangement of blastomeres, as opposed to spiral cleavage which gives rise to a spiral arrangement of blastomeres. Bilateral cleavage occurs in chordates, echinoderms and a few smaller groups, indicating their common origins whereas most other invertebrate phyla have spiral cleavage.
References in periodicals archive ?
The prominence of this cleavage had two implications for economic policy-making in this era.
Cycles were retrospectively split into those with normally cleaved embryos and cycles with one or more embryo cleavage irregularities.
5), Hutter asks "whether and how protest politics in Western Europe has changed because of the emergence of new integration-demarcation cleavage brought about by globalization" (p.
Her cleavage has been blurred by the censors at several places in the film where the board members found the display of flesh too ample.
? KELLY BROOK As an actress she has her knockers but when it comes to cleavage, Kelly reigns supreme.
So here I am Paula, wearing a bra in bed!" There are lots of lotions and potions that claim to get rid of crinkly cleavage, so here's where you should start.
In the normal first and second cleavages of fertilized sea urchin eggs, the location of the cleavage furrow is determined in two steps.
The mudstones are very fissile, breaking into a steeply plunging 'pencil' structure that is formed by the intersection of two steeply dipping cleavages (Fig.
The epitome of sophisticated beauty, she wasn't noted for her cleavage.
Although cleavage divisions were affected only at very high DMAE concentrations, embryos treated with lower concentrations at the two-cell stage subsequently developed malformations (Figure 3): overabundance of mesenchyme-like cells that accumulated first in the vegetal half of the blastocoel, and later occupied all of the blastocoel, blocking or inhibiting gastrulation; absence of a second pair of arms in mid-pluteus, or sometimes shortening or absence of one arm of the first pair (Figure 3H).
``It's a myth that you can't have a good cleavage if you're flat-chested because enough padding can work wonders,'' says Marks & Spencer lingerie advisor Paula Nolan.
Bra-maker Gossard has unveiled its latest weapon in the continuing battle for Britain's cleavage - the Super Boost Ultrabra.