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:(Greek, ''gastrula'' = little stomach) An early stage of an animal embryo development, occurring after blastula (blastocyst) stage in which the three ...rm layers]] that will form all the future tissues of the entire [[E#embryo|embryo]]. This process also establishes the the initial body axes.

Department of Embryology, Carnegie Institution of Washington, Baltimore, Mn. ...th its associated tiny mass of protoplasm, which alone will make the chick embryo, becomes all but lost on the surface of the yolk. But that speck of protopl

...pment of the trachea and esophagus and includes several embryos from the [[Carnegie Collection]]. Department Of Embryology, Carnegie Institution Of Washington, Baltimore, Maryland

...his historic 1952 paper by West describes two early embryos similar to a [[Carnegie stage 7]] (26 - 30 days), caudal neuropore closes, Somite Number 21-29. {{Carnegie stage 7 links}}

...certain that long before any vessels are present in the body of the human embryo, and at a time so early as considerably to precede the formation of any som ...urthermore, as Eternod discovered, when, later, the vascular trunks of the embryo proper make their appearance (the aorta? and vv. umbilicales), they are alr

...ltttea associated with 7‘/3- and 9‘/3-day normal pregnancies respectively (Carnegie nos. {{CE8020}}, {{CE8215}}). Unfortunately, these sections, which were sta ===A 12- to 13-Day Pregnancy, Carnegie No. {{CE8558}}, S46-2767===

...ranes and appendages, and the establishment of those relations between the embryo and the maternal organism which are such fundamental characteristics of the ...aternal uterine walls, and in the early and extensive relation between the embryo and this new source of nutrition.

...y Atlas of the 13-mm. Pig Embryo. (Prefaced by younger stages of the chick embryo.) The Wistar Institute Press, Philadelphia, iv & 104 pp. Corner, G. W., 1915. The corpus luteum of pregnancy as it is in swine. Carnegie Inst., Contrib. to E-mbryoL, Vol. 2, pp. 69-94.

...ent of the embryonic cavities using several early embryos from the later [[Carnegie Collection]]: {{CE2}}, {{CE6}}, {{CE9}}, {{CE10}}, {{CE22}}, {{CE34}}, {{CE ...tely, there are no data regarding the beginning of the coelom in the human embryo, and in all probability none will ever be found. The smallest human describ

==Peters's Embryo - Yolk-sac== ...that Peters's specimen has no allantois. In describing another very young embryo he had recorded that "as compared with the embryonic shield, the allantois

...of twin human embryos. With 17-19 paired somites makes these twin embryos Carnegie stage {{CS11}}. <br>[[Media:1915 Transitory cavities in the corpus striatum of the human embryo.pdf|PDF version]]

Fuss, A. 1911. Uber extraregioniaire Geschlechtzellen bei einem Menschhchen Embryo von vier wochen. Anat. Am. 39, 407. Gregory, P. W. 1930. The early embryology of the rabbit. Carnegie Inst. Wash. Contrib. to Embryol. 21, 141.

...he total number of somatic segments represented in the average ii mm human embryo (the time of maximum number) is 42 to 44 (fit, 391) The first occipital (Ar In a human embryo of about 5 mm the cells of the ventro-medial portion of, for example, the f

Acting Lecturer and Demonstrator in Anatomy, University College, London; tate Carnegie Research Fellow in Embryology, and Assistant in the Depariment of Anatomy, This stage is represented by one embryo 25 mm. in length, the cranial extremity of which has been reconstructed in

...ical study With few exceptions, the younger the stage of development of an embryo of a particular species the lower is the animal group which it resembles bo ...hology does not appear to be concerned with the further development of the embryo, although the genetic structure of the male gametes is of fundamental impor

...after the 60 mm embryo stage|Plate 13. Placental structure after the 60 mm embryo stage.]] The numerous contributions from the Carnegie Laboratory of Embryology on implantation of the blastocyst and on placental

=A Human Embryo of Twenty-Four Pairs of Somites= ...] | [[Book_-_Contributions_to_Embryology|Contributions to Embryology]] | [[Carnegie stage 12]] | [[Week 4]]

...the early development of the neural folds and sensory anlagen of the human embryo. ...ez and Evans’ (’25) significant monograph on “The development of the human embryo during the period of somite formation, including embryos with 2 to 16 pairs

...ernal appearance and dimensions suggest that it is a [[Carnegie stage 19]] embryo ([[Week 7]], 48 - 51 days, 16 - 18 mm). {{Carnegie stage 19 links}}

embryo (Heuser and Streeter, 1941 ; Hertig embryo extract prepared from 19- to 20day-old guinea pig embryos (Blandau and