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Fig. 512. Vascular system of a human embryo of 1.3 mm in length

Schematic lateral view of the embryo shown in Fig. 511.

(After Eternod.)


The heart is located directly in front of the germinal disc in the boundary of the Yolk sac. From the heart arise from two aortas. Each aorta has two arterial arch, and a third is still rudimentary. The two aortic run separately on each side of the notochord to the rear, without connect and go through the belly stalk separated by the chorionic villi.

The chorionic villi from the umbilical veins returning Primitiva unite in the abdominal peduncle a short trunk, inferior vena umbilicalis impar, which follows the Allantoisgang. Shares after a short course in the unpaired base in two large veins, which run close to the marginal ridge of the yolk sac to the front of the yellow pages of the embryo Alfeld. These two lateral umbilical veins split in the rear Heart thighs, this horseshoe-shaped grip around the head end of the Area embryonalis. The umbilical veins lateral caudal to take two vitelline veins veins vitellina on. They arise from the wide capillaries that the yolk sac islands (Wolff) surrounded. These veins vitellina Ansa vitellina form a loop around the mouth of the allantois.


This text is a Google translate computer generated translation and may contain many errors.

Images from - Atlas of the Development of Man (Volume 2)

(Handatlas der entwicklungsgeschichte des menschen)

Kollmann Atlas 2: Gastrointestinal | Respiratory | Urogenital | Cardiovascular | Neural | Integumentary | Smell | Vision | Hearing | Kollmann Atlas 1 | Kollmann Atlas 2 | Julius Kollmann
Links: Julius Kollman | Atlas Vol.1 | Atlas Vol.2 | Embryology History
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Kollmann JKE. Atlas of the Development of Man (Handatlas der entwicklungsgeschichte des menschen). (1907) Vol.1 and Vol. 2. Jena, Gustav Fischer. (1898).



Cite this page: Hill, M.A. (2024, April 24) Embryology Kollmann512.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Kollmann512.jpg

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Fig. 512. Qefäßsystem eines menschlichen Embryo von 1,3 mm Länge.

Schema. Norma lateralis des Embryo Fig. 511.

(Nach E tarn od.)


Das Herz befindet sich unmittelbar vor der Keimscheibe in dem Rand des Dottersackes. Aus dem Herz entspringen zwei Aorten. Jede Aorta besitzt zwei arterielle Bogen, ein dritter ist noch rudimentär. Die beiden Aorten verlaufen zu beiden Seiten der Chordaanlage getrennt nach hinten, ohne sich zu verbinden und gehen getrennt durch den Bauchstiel nach den Chorionzotten.

Die aus den Chorionzotten zurückkehrenden Venae umbilicales primitivae vereinigen sich im Pedunculus abdominalis zu einem kurzen Stamm, Vena umbilicalis impar, der dem Allantoisgang folgt. Nach kurzem Verlauf teilt sich der unpaare Stamm in zwei große Venen, welche in dem Randwulst des Dottersackes nach vorn ziehen dicht an den Seiten des gelben Embryonalfeldes. Diese beiden Venae umbilicales laterales ergießen sich getrennt in die hinteren Herzschenkel, diese umgreife^ hufeisenförmig das Kopfende der Area embryonalis. Die Venae umbilicales laterales nehmen kaudal zwei Dottervenen Venae vitellinae auf. Sie entstehen aus den weiten Kapillaren, welche die Dottersackinseln (Wolff) umgeben. Diese Venae vitellinae bilden eine Schlinge Ansa vitellina um die Mündung des AUantoisganges.

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