n
The outer layer (and its major cell type and its specialized protein) of the endosperm.
n
The production of amastigotes
n
(embryology) The hemisphere of the blastula which eventually gives rise to the three germ layers and is composed of small cells that are in a state of rapid division.
n
(biology) A primordium, the initial clustering of embryonic cells from which a body part develops.
n
(biology) A hollow blastula, supposed to be the primitive form.
n
(physiology) A clump of undifferentiated cells or blasts, from which an organ or body part will develop, either during the normal growth of an embryo or in the regeneration of a lost body part.
n
(biology) A small clear space in the segments of the ovum, the precursor of the nucleus.
n
(anatomy) The clear or shiny colorless fluid in the blastodermic vesicles.
n
The fluid-filled cavity in a blastula.
n
Alternative spelling of blastocoel [The fluid-filled cavity in a blastula.]
n
(biology) The mammalian blastula
adj
(embryology) Pertaining to, or connected with, a blastocyst
n
An undifferentiated cell in the blastula stage of an embryo.
n
(embryology) The germination point in an ovum from which the embryo develops.
adj
Of or relating to the blastoderm.
adj
Of or pertaining to the blastoderm.
n
Alternative form of blastodisk [(biology) A round, flattened region of cells from which the embryo of many vertebrates begins to develop in the fertilized ovum; a germinal disk]
n
(biology) A round, flattened region of cells from which the embryo of many vertebrates begins to develop in the fertilized ovum; a germinal disk
n
(medicine) A blastocyst grown in-vitro.
n
(biology) The movement of an insect embryo into the yolk-mass of the egg
n
Alternative form of blastomere [(biology) Any cell that results from division of a fertilized egg.]
n
(biology) Any cell that results from division of a fertilized egg.
adj
(biology) Pertaining to a blastopore; blastoporic.
n
(embryology) The opening into the archenteron
adj
(embryology) blastular
n
The destruction of blastomeres.
n
(embryology) An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.
adj
(embryology) Pertaining to, or connected with, a blastula
n
Alternative form of blastula [(embryology) An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.]
n
(biotechnology) A common ovary epithelial cell type used in biotechnology applications.
n
(biology) The part of an egg that becomes mesenchyme
n
(biology) The point, in the yolk of an egg, from which the embryo is formed.
adj
(anatomy) That surrounds blastopores
n
(biology) Synonym of hypoblast
n
A hollow blastula formed from blastomeres.
n
(zoology) Germinal tissue of Porifera that forms cores or developing mesoderms
n
A germ cell found in insects, which becomes the insect equivalent of a platelet (a cystocyte) instead of turning into a reproductive cell.
n
(biology) A substance, present in an egg or blastomere, that determines the fate of those cells that inherit it during cleavage.
n
(cytology) The inner layer of the trophoblast.
n
(biology) The formation of a gastrula by the splitting of the blastoderm
n
An embryonal sac having two cell layers, ectoderm and entoderm.
adj
(biology) Having two embryonic germ layers (the ectoderm and the endoderm)
n
A discoid blastula formed by cleavage of a meroblastic egg
n
(dated, biology) The outer layer of the blastoderm; the ectoderm or epiblast.
n
Any of the blastomeres from which the ectoderm forms
n
A mass of cells at the embryonic pole of the blastocyst, that develops to form the embryo
n
(biology) An embryonic blastomere that has not yet differentiated into mesoderm and endoderm, almost in the middle
n
Any of the embryonic blastomeres that develop into the endoderm
n
The inner granular layer of protoplasm in a developing ovum.
n
(biology, embryology) The outer layer of a blastula that, after gastrulation, becomes the ectoderm.
n
(embryology) The expansion of one cell sheet over other cells, as takes place during gastrulation or secondary intention wound healing.
n
(cytology) Flexible cytoplasmic protrusions that modify the normal contractile activity of pericytes.
n
The yolk of an egg, especially when used as food for the developing embryo.
n
(embryology) A stage in the development of embryos of most animals consisting of a three-layered sac of ectoderm, mesoderm and endoderm.
n
(embryology, biology) The stage of embryo development at which a gastrula is formed from the blastula by the inward migration of cells.
n
(biology) An aggregate of embryonic stem cells
n
(embryology) A collection of cells assembled during embryogenesis that eventually develop into all tissues and organs via organogenesis in animals.
n
(embryology) The band of germ layers that forms on the ventral side of the embryo during gastrulation in insects.
n
(biology) Alternative form of germinal disk [(biology) a small circular white spot on the surface of the yolk of an egg]
n
(biology) a small circular white spot on the surface of the yolk of an egg
n
Alternative form of germ layer [(embryology) A collection of cells assembled during embryogenesis that eventually develop into all tissues and organs via organogenesis in animals.]
n
A kind of diaphragm cell.
n
(biology) An ovum composed entirely of germinal matter.
adj
(biology, of an egg) Cleaving, and separating into separate blastomeres.
n
(embryology) A type of tissue that forms from the inner cell mass and later is incorporated into the endoderm
n
(embryology) A mass of cells within a primordial embryo that will eventually develop into the distinct form of a fetus in most eutherian mammals.
n
A form of development in which the embryo receives no nutrition other than the yolk originally contained within its egg.
n
(biochemistry) A protein found in egg yolk and involved in lipid and metal storage.
n
(biology) An ovum (egg) that has both germinal and nutritive parts
adj
(of a fertilized egg) that undergoes only partial cleavage
n
(biology) Any cell formed by division of a meroblastic ovum
n
The region involved in the separation of mesoderm and ectoderm
n
(embryology) An embryonic tissue layer which differentiates into mesoderm and endoderm
n
(biology) the middle, germinal layer of undifferentiated cells of an early embryo; it becomes the mesoderm
n
(embryology) One of the three tissue layers in the embryo of a metazoan animal. Through embryonic development, it will produce many internal organs of the adult, e.g. muscles, spine and circulatory system.
n
A blastomere that is intermediate in size between a micromere and a macromere
n
(biology) A stage, in the development of an embryo, at which zygotic gene transcription is activated
n
(embryology) A spherical mass of blastomeres that forms following the splitting of a zygote; it becomes the blastula
n
(biology) A spermatocyte or spermoblast.
n
(zoology) An embryo of vertebrates in the stage when the primitive band is first developed.
n
(biology) A large secretory cell found in clusters underlying the epidermis of larval abdominal segments.
n
(biology) A cell that develops into an ovum; a germinal epithelium giving rise to ova.
n
The cell membrane of an oocyte.
n
(biology) A portion of the mesoblast (of peripheral origin) of the developing embryo, whose cells are involved in the formation of the first blood and blood vessels.
n
(biology) The protoplasmic matter which surrounds the entoblast, or cell nucleus, and undergoes segmentation.
n
(biology) 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.
n
(cytology) The outer, syncytial layer of the trophoblast.
n
(embryology) The division of an embryo into an animal pole and a vegetal pole within a blastula. ᵂᵖ
adj
Following formation of a blastoderm
adj
Alternative form of preblastodermic [Prior to the development of a blastoderm]
adj
That develops to form blastoderm
n
(embryology) A formation that occurs during the initial phases of embryonic development in birds, reptiles and mammals.
adj
That develops into an acrosomal granule, vesicle etc
n
(embryology, obsolete) Synonym of blastopore
n
A group of cells that develops into the ectoderm, nervous system and nephridia of an annelid
n
(cytology) Any of the cells of the neuroglia that have spongy vacuolated protoplasm
n
(cytology) An essential characteristic of a stem cell that distinguishes it from ordinary cells.
n
A blastula without a clear central cavity.
n
(cytology) The outer layer of the trophoblast.
n
(biology) The nucleus of the impregnated ovum, as distinguished from that of the spermatozoon (called the masculonucleus or arsenoblast).
n
A triploblastic blastula
n
A condition of the blastula in which there are three primary germ layers: the ectoderm, mesoderm, and endoderm.
n
(biology) The ectoderm from which the trophoblast develops.
n
(cytology) The membrane of cells that forms the wall of a blastocyst during early pregnancy, providing nutrients to the embryo and later developing into part of the placenta.
n
A trophoblast together with the vascular mesodermal layer underlying it
n
Alternative form of trophectoderm [(biology) The ectoderm from which the trophoblast develops.]
n
(embryology) The hemisphere of the blastula opposite to the animal pole comprising large yolk cells dividing at a slower rate that eventually differentiate into the extraembryonic membranes.
n
(biochemistry) A protein found in egg yolk.
n
Alternative form of vitellogenin [(biochemistry) An egg-yolk precursor protein expressed in the females of nearly all oviparous species.]
n
The mesonephros and paramesonephrotic blastema.
n
The large edible endothermal cells surrounded by the blastopore of an amphibian gastrula during its later stages
n
(anatomy) A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals.
n
Alternative form of yolk sac [(anatomy) A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals.]
n
(embryology) A region of mesenchymal connective tissue that carries instructions which direct the developing limb bud to form along the anterior-posterior axis.
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