Slideshow: Umbilical Cord, Placenta & More

Close-up of Umbilical Cord

#25, Slide 16 of 35

7 weeks, 4 days

From The Biology of Prenatal Development.

Note:

There are normally 2 umbilical arteries and 1 umbilical vein. The umbilical vein carries oxygen-rich blood from the placenta to the embryo and is recognizable by its larger size and brighter red color.

Label Key:

1. placental vessels

2. umbilical vein

3. placenta

4. umbilical arteries

All ages referenced to fertilization, not last menstrual period.

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