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Fig. 2 | BMC Developmental Biology

Fig. 2

From: The growth pattern of the human intestine and its mesentery

Fig. 2

Landmark structures for the apex of the midgut loop. Histological section of a CS14 embryo (s5029, panel a) and magnification of the boxed region (panel b) showing the very thin connection (arrowhead) between the right vitelline vein (7) and the midgut loop near its apex. Panels c and d: histological sections of a CS14 embryo (s2201). Panel e: Magnification of the boxed region from C to show the proximity of the right vitelline vein (7) and the vitelline duct (8). Panel f: Magnification of the boxed region from D to show that inside the umbilicus the open vitelline duct (8), vitelline artery (3) and right vitelline vein (7) are surrounded by the periductal mesenchyme. Panel g: Midsagittal histological section of a CS16 embryo (s5032). Panel h: The magnification of the boxed area from panel g. The right vitelline vein (7) lost its connection with the midgut and courses as a free vessel in the body cavity. Panel i: The magnification of the same region in G from a more lateral section to show that the vitelline duct is no longer present as open duct inside the periductal mesenchyme (81). Scale bar units: μm

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