The development of the human body; a manual of human embryology . en Fig. 126.—Diagrams Illustrating the Formation of the Heart in the mesoderm is represented in black and the endocardium by a broken line, am, Amnion; en, endoderm; /;, heart; ;, digestive tract. —(After Strahl and Carius.) The simple cylindrical form soon changes, however, theheart tube in embryos of mm. in length having be-21 250 THE DEVELOPMENT OF THE HUMAN BODY. come bent upon itself into a somewhat S-shaped curve(Fig. 127). Dorsally and to the left is the lower end intowhich the sinus venosus opens, and

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The development of the human body; a manual of human embryology . en Fig. 126.—Diagrams Illustrating the Formation of the Heart in the mesoderm is represented in black and the endocardium by a broken line, am, Amnion; en, endoderm; /;, heart; ;, digestive tract. —(After Strahl and Carius.) The simple cylindrical form soon changes, however, theheart tube in embryos of mm. in length having be-21 250 THE DEVELOPMENT OF THE HUMAN BODY. come bent upon itself into a somewhat S-shaped curve(Fig. 127). Dorsally and to the left is the lower end intowhich the sinus venosus opens, and from this the hearttube ascends somewhat and then bends so as to pass atfirst ventrally and then downward and to the right, whereit again bends at first dorsally and then anteriorly to passover into the aortic bulb. The portion of the curve which. Fig. 127.—Heart of Embryoop mm., from a recon-struction. a, Auricle; ab, aortic bulb; d,diaphragm; dc, ductus Cuvieri;I, liver; v, ventricle; vj, jugu-lar vein; vu, umbilical vein.—{His.)

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902