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The Endowment for Human Development
The Endowment for Human Development
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Close-up, Umbilical Cord at 7½ Weeks

7 weeks, 4 days

From The Biology of Prenatal Development.Buy Now

Note:

The coiled umbilical cord contains one vein and two arteries. Arteries always carry blood away from the heart, while veins return blood to the heart.

Note:

Note the brighter red color of the umbilical vein, reflecting its cargo of oxygenated blood that is returning from the placenta.

Label Key:

1. umbilical vein
2. vitelline vessels (yolk stalk)
3. umbilical arteries
4. placental vessels
All ages referenced to fertilization, not last menstrual period.
The Right Hand
The Right Hand
Close-up of the Right Knee
Close-up of the Right Knee
Close-up, Umbilical Cord at 7½ Weeks
Close-up, Umbilical Cord at 7½ Weeks
Base of Umbilical Cord, 7½ Weeks
Base of Umbilical Cord, 7½ Weeks
7½-Week Embryo
7½-Week Embryo
Fingers and Notches
Fingers and Notches


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