ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Umbilical cord. Light micrograph (LM) of a section through a human umbilical cord showing the vein (centre). The empty vein consists of an inner folded lumen (white) and an inner endothelial layer (purple). Most of the vein consists of several circular layers of smooth muscle. Around the vein is the jelly-like mucous connective tissue (blue) known as Wharton's jelly. The umbilical cord is the attachment connecting the foetus with the placenta, and by which the foetus receives nourishment from the mother's blood. Azan stain. Magnification: x12.5 at 35mm size.
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