Fig. 3The paraumbilical vein, a thin artery along the umbilical vein (UV), and thick lymphatic vessels along the umbilical artery (UA) of four fetuses with crown-rump length (CRL) of 46 mm to 92 mm. Panels other than panel B, H&E staining; (B) Azan staining. (A) Shows a sagittal section of a fetus with a CRL of 46 mm CRL (same specimen a s in
). (B) Shows a horizontal section of a fetus with a CRL of 92 mm. (C) Shows a horizontal section of a fetus with a CRL of 90 mm. (D–F) Show horizontal sections of a fetus with a CRL of 75 mm. (A) Shows a thin artery along the UV and a candidate lymphatic vessel (triangles) along the UA; the insert shows the thin artery (arrows) that originates from the left hepatic artery (LHA). The vein along the UV in panels A to C is the so-called “para-umbilical vein”. (D) Shows bilateral thick lymphatic vessels along the urinary bladder (UB). Panels E and F are higher magnification views of the rectangles in panel D, and show that the lymphatic vessels contain a cluster of primitive lymphocytes. Scale bars in A to D=1 mm; in E and F=0.1 mm. RA, rectus abdominis.
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eISSN 2093-3673
