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a form of cell division occurring in centrolecithal zygotes, in which only the surface region participates.Medical dictionary. 2011.
superficial cleavage — noun : meroblastic cleavage in which a layer of cells is produced about a central mass of yolk (as in many arthropod eggs) compare discoidal cleavage … Useful english dictionary
Cleavage (embryo) — In embryology, cleavage is the division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived … Wikipedia
cleavage — 1. Series of mitotic cell divisions occurring in the ovum immediately following its fertilization. SYN: segmentation (2). SEE ALSO: c. division. 2. Splitting of a complex molecule into two or more simpler molecules. SYN: scission (2). 3 … Medical dictionary
discoidal cleavage — noun : meroblastic cleavage in which a disk of cells is produced at the animal pole of the zygote (as in bird eggs) compare superficial cleavage … Useful english dictionary
Schizont — Schi zont (sk[imac] z[o^]nt or sk[imac]z [o^]nt), n. [Gr. ?, ?, p.pr., cleaving.] (Zo[ o]l.) In certain Sporozoa, a cell formed by the growth of a sporozoite or merozoite (in a cell or corpuscle of the host) which segment by superficial cleavage … The Collaborative International Dictionary of English
Urticina crassicornis — Taxobox name = Urticina crassicornis image width = 250px image caption = Urticina crassicornis regnum = Animalia phylum = Cnidaria classis = Anthozoa ordo = Actinaria familia = Actiniidae genus = Urticina species = U. crassicornis binomial =… … Wikipedia
centrolecithal egg — (ARTHROPODA) A type of arthropod egg in which the nucleus is located centrally in a small amount of nonyolky cytoplasm surrounded by a large mass of yolk until fertilized; when nuclear divisions begin the nuclei migrate to the periphery to… … Dictionary of invertebrate zoology
human embryology — ▪ biology Introduction the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth. The human body, like that of most animals, develops from a single cell produced by the union of… … Universalium
animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by … Universalium
Navel — For other uses, see Navel (disambiguation). Belly button redirects here. For other uses, see Belly button (disambiguation). Navel Human innie navel … Wikipedia
