| 释义 |
erythroblast
e·ryth·ro·blast E0205400 (ĭ-rĭth′rə-blăst′)n. Any of the nucleated cells normally found only in bone marrow that are precursors of erythrocytes.
[German Erythroblast : erythro-, erythro- (from Greek eruthros, red; see erythro-) + -blast, -blast (from Greek blastos, bud, germ; see -blast).]
e·ryth′ro·blas′tic adj.erythroblast (ɪˈrɪθrəʊˌblæst) n (Physiology) a nucleated cell in bone marrow that develops into an erythrocyte eˌrythroˈblastic adje•ryth•ro•blast (ɪˈrɪθ rəˌblæst)
n. a nucleated cell in the bone marrow from which a red blood cell develops. [1885–90] e•ryth`ro•blas′tic, adj. Thesaurus| Noun | 1. | erythroblast - a nucleated cell in bone marrow from which red blood cells developembryonic cell, formative cell - a cell of an embryosideroblast - an erythroblast having granules of ferritin |
TranslationsErythroblast
erythroblast[ə′rith·rə‚blast] (histology) A nucleated cell occurring in bone marrow as the earliest recognizable cell of the erythrocytic series. Erythroblast intermediate form of development of a red blood cell, or erythrocyte. In mammals and in man, erythroblasts have nuclei and reproduce themselves, unlike mature erythrocytes, which lack nuclei and are unable to reproduce. In the lower vertebrates (reptiles, amphibians, and fishes), hematopoiesis takes place in the liver, the kidneys, and partly the blood vessels, where erythroblasts may be found together with mature erythrocytes. During the embryonic development of the higher, or warm-blooded, vertebrates (birds and mammals) and man, erythroblasts are formed in the vessels of the yolk sac and transformed into primary erythrocytes, which soon die. In man, they concentrate after birth in the bone marrow, where they develop from hemocytoblasts; it is only in pathological cases that erythroblasts are found in peripheral blood. The number of erythroblasts and their rate of reproduction increase in anemia. After the erythrocyte level in the blood is restored to normal, erythroblast activity in the bone marrow declines. erythroblast
erythroblast [ĕ-rith´ro-blast] a term originally used for any type of nucleated erythrocyte" >erythrocyte, but now usually limited to one of the nucleated precursors of an erythrocyte, i.e. one of the developmental stages in the series" >erythrocytic series, in contrast to a megaloblast. In this usage, it is called also normoblast.basophilic erythroblast a nucleated precursor in the series" >erythrocytic series, preceding the polychromatophilic erythroblast and following the proerythroblast; the cytoplasm is basophilic, the nucleus is large with clumped chromatin, and the nucleoli have disappeared. Called also basophilic normoblast.orthochromatic erythroblast see normoblast.polychromatic erythroblast (polychromatophilic erythroblast) see normoblast.e·ryth·ro·blast (ĕ-rith'rō-blast), Originally, a term denoting all forms of human red blood cells containing a nucleus, both pathologic (that is, megaloblastic) and normal (for example, normoblastic). The pathologic or megaloblastic series is observed in pernicious anemia in relapse. The term megaloblast is also used to indicate the first generation of cells in the red blood cell series that can be distinguished morphologically; hence, with this usage, megaloblast denotes both a normal and an abnormal cell. In the erythroblastic series of maturation four stages of development can be recognized: 1) proerythroblast, 2) basophilic erythroblast, 3) polychromatic erythroblast, and 4) orthochromatic erythroblast. In the megaloblastic series of maturation, stages similar to those found in the normoblastic series are seen: 1) promegaloblast, 2) basophilic megaloblast, 3) polychromatic megaloblast, and 4) orthochromatic megaloblast. In the normal series of maturation, after loss of the nucleus, young erythrocytes are called reticulocytes; these cells may be recognized with supravital stains such as brilliant cresyl blue; ultimately the reticulocytes become erythrocytes, or mature red blood cells. Synonym(s): erythrocytoblast [erythro- + G. blastos, germ] erythroblast (ĭ-rĭth′rə-blăst′)n. Any of the nucleated cells normally found only in bone marrow that develop into erythrocytes.
e·ryth′ro·blas′tic adj.e·ryth·ro·blast (ĕ-rith'rō-blast) The first generation of cells in the red blood cell series that can be distinguished from precursor endothelial cells. In normal maturation, four stages of development can be recognized: pronormoblast, basophilic normoblast, polychromatic normoblast, and orthochromatic normoblast. [erythro- + G. blastos, germ]erythroblast A primitive, nucleated red blood cell. A stage in the development of the normal non-nucleated red cell (ERYTHROCYTE) found in the circulating blood.erythroblast a nucleated cell occurring in bone marrow as the first identifiable stage of red blood cell formation; See ERYTHROCYTE.Loevit, Moritz, Austrian pathologist, 1851-1918. Loevit cell - originally a term denoting all forms of human red blood cells containing a nucleus, both pathologic and normal. Synonym(s): erythroblaste·ryth·ro·blast (ĕ-rith'rō-blast) The first generation of cells in the red blood cell series that can be distinguished from precursor endothelial cells. [erythro- + G. blastos, germ]erythroblast
Related to erythroblast: monoblastWords related to erythroblastnoun a nucleated cell in bone marrow from which red blood cells developRelated Words- embryonic cell
- formative cell
- sideroblast
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