How to use ectoderm in a sentence

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Sentence Examples This process, called induction, culminates in the formation of a thickening in the ectoderm germ layer known as the neural plate. The prospective endoderm displaces the hypoblast and the mesoderm forms a layer between ectoderm and endoderm. It is involved in mesoderm development and differentiation of the neural ectoderm into epidermoblasts and neuroblasts. Structures derived from ectoderm, mesoderm, and endoderm are commonly represented. Acrochordons, or skin tags, are derived from ectoderm and mesoderm and represent a hyperplastic epidermis. By the time segmentation is complete, strong mxp expression is detected in both ectoderm and mesoderm of the maxillary and labial limb buds. The stem cell lines also retain the ability, throughout the culture, to differentiate into tissue-derived endoderm, mesoderm and ectoderm. The mouth and pharynx are derived by a secondary infolding of superficial ectoderm called the stomodeum. Teratoma typically contains tissues derived from all 3 germinal layers, whereas dermoid cyst presumably originates from ectoderm and mesoderm. In this tissue, therefore, the fate of some of the cells has been changed from prospective gut endoderm to mesoderm and ectoderm. The mesoderm then lies immediately beneath the ectoderm, with the endoderm lining the roof of the archenteron, the future gut. The cells lying between the primitive endoderm and the polar trophectoderm comprise the embryonic ectoderm or epiblast. Using vital dyes as lineage tracers, the pattern of cleavage has been shown to be invariant but complex, particularly for the ectoderm. The juvenile, which forms within the larval ectoderm, independently develops a serotonergic system. The tip of the optic stalk is a considerable distance from the surface ectoderm. The branchial arches begin as cylindrical cores of mesenchyme sandwiched between continuous sheets of epidermal ectoderm and internal endoderm. The critical process depends upon whether the ectoderm can contact a condensate of specialized mesenchyme called the dermal papillae. The somatopleure, which is close to the ectoderm, is involved in the formation of the lateral and ventral walls of the embryo. Moreover, these ectopic neural tubes were patterned appropriately with respect to the notochord and dorsal ectoderm. While the notochord and somites are developing, the neural plate ectoderm above them begins to develop into the neural tube and the embryo is then called a neurula. Show More Sentences The head region of the embryo is demarcated anterior to the node by the head fold, an infolding of the blastoderm composed of both ectoderm and endoderm. The flatworms are acoelomate triploblasts i.e., they lack a body cavity and have three embryonic tissue layers: endoderm, mesoderm, and ectoderm. Jellyfish, like the other animals in their family are made up of two jelly-like layers called an ectoderm and an endoderm. A slight invagination of the ectoderm occurs, and a cloacal membrane forms, separating the ectodermal invagination from the gut cavity. Because of its mode of origin, the oral cavity is in part lined by ectoderm and in part by endoderm, the two parts becoming indistinguishable. From there, he classifies cancers and diseases, depending on if the organ is from the endoderm, old mesoderm, new mesoderm, or the ectoderm. The presumptive neural tube tissues consist of a layer of ectoderm along the dorsal midline of the embryo, between the notochord and an outer layer of epidermis. Since he had a differentiated ectoderm separate from the gut, and also had a longitudinal layer of muscle and bilateral symmetry, he probably had some degree of motility. Using Lankester's terms epiblast, hypoblast and mesoblast for the embryonic germ layers, Balfour described chick ectoderm and endoderm for the first time in English. These grow inward and eventually fuse to form the endoderm of the midgut, while ectoderm is dragged inward behind them at each end to form the foregut and the hindgut. Experimental observations on the development of ectoderm free mesoderm of the limb bud in chick embryos. There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them. The ectoderm consists primarily of epitheliomuscular cells, neurons, gland cells and cnidocytes. Chitin usually occurs throughout Invertebrates in the form of an investment to the outermost cellular layer or ectoderm. After closure, the neuro-ectoderm separates from the cutaneous ectoderm, and the space between is filled by mesoderm. The trigrams, among other aspects of life, represent the three embryonic layers, the endoderm, the mesoderm and the ectoderm, as well as the nucleus, the cytoplasm and membranes of the cells. Also, more in reference to fetal embryology, the skin, or epidermis, originates from the same ectoderm as the central nervous system. Separation of neural and surface ectoderm after closure of rostral neuropore. Teratoma: a benign, encapsulated mass of complex differentiated tissues comprising elements of all three embryonic germ layers: ectoderm, endoderm, and mesoderm. Characteristic of chordates is the development of the nervous system from a part of ectoderm lying originally on the dorsal side of the embryo, above the notochord and the somites. Show More Sentences The embryo showed embryonic ectoderm and endoderm, it now had reached the gastrula stage. On the mechanisms of the dorsalization in the ectoderm of Triturus gastrulae caused by precytolytic treatments. The lateral pockets of the pharyngeal cavity, called the pharyngeal pouches, perforate the mesodermal layer, reach the ectoderm, and break through to form pharyngeal, or gill, clefts. Dermoid cysts are mature cystic teratomas that may have components from 3 germ-cell layers that predominantly include mature ectoderm elements. The foregut and hindgut arise from the ectoderm, while the midgut arises from the endoderm. Only cells of the inner cell mass from blastocyst have the pluripotent capacity for formation of all three primary germ layers, endoderm, mesoderm, and ectoderm. In the early embryonic epiblast, some cells develop into the neural system and thus become neural ectoderm, including the neural tube and neural crest. Examples from Classical Literature At the anterior end of the preoral lobe is a nervous thickening of the ectoderm called 226 the apical plate. Now, the original lens was built out of the ectoderm, while the iris is of mesodermic origin. Between the ectoderm and endoderm a gelatinous supporting layer, termed the mesogloea, makes its appearance. The blastula differentiates itself into embryonic layers, the ectoderm, endoderm, and mesoderm already mentioned. Amongst other structures which arise from the important layer of ectoderm are the teeth. The external layer, or ectoderm, is made up of cells, and contains also muscular and nervous elements. In the course of development, however, cells from the ectoderm and endoderm may migrate into it. It has been shown that these asulcar filaments are derived from the ectoderm, the remainder from the endoderm. Ontogeny teaches unmistakably that its elementary organs, the epidermic cells, develop entirely from the ectoderm. The former is closely applied to the ectoderm, forming with it the somatopleure or body-wall. The mesenchymal tissue between the mesothelium and the ectoderm forms the mass of the skeletal, muscular and vascular systems. Farther up, within the velar area, the rudiments of the cerebral nerve-ganglion ng are seen separating from the ectoderm. Note, in a cross-section, that there are small ovoid or cuboid cells at the bases of the large ectoderm cells. In it cleavage gives rise to a solid mass, which divides by delamination into two layers, the ectoderm and endoderm. It arises, however, by delamination from the ectoderm, the tube being a secondary acquisition. It is enough for us that they always end in the formation of the two primary layers of ectoderm and endoderm. The terms ectoderm and entoderm were introduced by Allman in 1853 for the two cell-layers in the Hydrozoa. The two layers of the gastrula may now be spoken of as ectoderm and entoderm. The body consists of two layers of cells, the ectoderm on the outside and the entoderm lining the digestive cavity. Also almost any part of the animal containing both ectoderm and entoderm can be cut off and will develop into a new animal. Show More Sentences This is indicated by the fact that they appear in some cases to be lined by an ingrowth of ectoderm. Some of the interstitial cells become modified and pushed up between the ectoderm cells to form cnidoblast cells. The outer is the ectoderm and the inner is the Endoderm or Hypoblast. The ectoderm retains its ciliation only in the sensory organs. The medusoids have a muscular velum of ectoderm and mesogloea only. Find more words! 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What is the opposite of ectoderm? Words that rhyme with ectoderm What is the plural of ectoderm? What is the adverb for ectoderm? What is the adjective for ectoderm? What is the noun for ectoderm? Use our Sentence Generator Nearby Words ectocervix ecthyma ectatic ectasia ECT ecstatics ectodermal ectogenesis ectomorph ectomorphic ectomorphs ectomycorrhiza 8-letter Words Starting With e ec ect ecto ectod ectode ectoder