- radial cleavage
- a cleavage pattern characteristic of vertebrates and echinoderms, in which the spindle axes are parallel or at right angles to the polar axis of the zygote.
Medical dictionary. 2011.
Medical dictionary. 2011.
radial cleavage — noun Date: 1973 holoblastic cleavage that is typical of deuterostomes and that is characterized by arrangement of the blastomeres of each upper tier directly over those of the next lower tier resulting in radial symmetry around the pole to pole… … New Collegiate 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
Radial — In skeletal anatomy, radial refers to the radius, the smaller of the two bones on the thumb side of the forearm. (The bigger bone in the forearm is the ulna). In ophthalmology, a radial keratotomy is a procedure in which incisions (cuts) are made … Medical dictionary
cleavage — The early divisions of the fertilized egg to form blastomeres. The cleavage pattern is radial in some phyla, spiral in others … Dictionary of molecular biology
spiral cleavage — noun Date: 1892 holoblastic cleavage that is typical of protostomes and that is characterized by arrangement of the blastomeres of each upper tier over the cell junctions of the next lower tier so that the blastomeres spiral around the pole to… … New Collegiate Dictionary
animal — animalic /an euh mal ik/, animalian /an euh may lee euhn, mayl yeuhn/, adj. /an euh meuhl/, n. 1. any member of the kingdom Animalia, comprising multicellular organisms that have a well defined shape and usually limited growth, can move… … Universalium
Blastopore — Infobox Embryology Name = PAGENAME Latin = GraySubject = 6 GrayPage = 47 Caption = Caption2 = System = CarnegieStage = Days = Precursor = GivesRiseTo = MeshName = MeshNumber = DorlandsPre = b 14 DorlandsSuf = 12188030 A blastopore is an opening… … Wikipedia
Deuterostome — Deuterostomes Temporal range: Late Ediacaran – Recent … Wikipedia
Protostome — Taxobox name = Protostomes fossil range = Ediacaran Recent image width = 200px image caption = Caribbean Reef Squid, an example of Protostome regnum = Animalia subregnum = Eumetazoa unranked phylum = Bilateria unranked classis = Protostomia… … Wikipedia
Lophotrochozoa — Taxobox name = Lophotrochozoa fossil range = Early Cambrian Recent image width = 200px image caption = Caribbean Reef Squid or Sepioteuthis sepioidea is a complex lophotrochozoan. regnum = Animalia subregnum = Eumetazoa unranked phylum =… … Wikipedia