Section through the heart of human embryo showing the formation of the cardiac septa and the auriculo-ventricular valves, (see 9N3690) from a somewhat more advanced embryo. Ad, As, right and left auricle; Ost, auriculo-ventricular apertures; S.s, septum superior of auricles; S. it, endocardial cushion (septum intermedium); S. if, septum infers ventriculorum, now denser and more muscular.

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Science History Images / Alamy Stock Photo

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T951J2

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40.5 MB (2 MB Compressed download)

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3496 x 4050 px | 29.6 x 34.3 cm | 11.7 x 13.5 inches | 300dpi

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28 August 2017

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Science History Images

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This image could have imperfections as it’s either historical or reportage.

Human Embryo, Heart Development

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RM2AWGA8T–The development of the human body; a manual of human embryology . Fig. 55.—Diagram of a Longitudinal Section through an Embryo OF 1.54 MM. al, Allantois; am, amnion; B, belly-stalk; ch, chorion; h, heart; ucneurenteric canal; Y, chorionic villi; Y, yolk-sac.—(von Spec.) (Fig. 40) so that their edges finally come into contact andlater fuse, the two ectodermal layers forming the oneuniting with the corresponding layers of the other (Fig.56). By this process the medullary groove becomes con-verted into a medullary canal which later becomes the THE MEDULLARY CANAL. 115.

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RMT951HW–Section through the heart of human embryo showing the formation of the cardiac septa and the auriculo-ventricular valves, 5 to 6 weeks. R.V, right auricle; L.V, left auricle; S.r.d, right horn of sinus; Sr.s, left horn of sinus; s. int, septum superior and endocardial cushion (septum intermedium); s. inf, septum infers ventriculorum; This septum, as well as the bulk of the ventricle, is a muscular sponge at this stage. Oc, esophagus; Br, bronchus.

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