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The Endowment for Human Development
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Slideshow: Eyes, Ears, Mouth & Nose

The Mouth, Lips, and Tongue

#159, Slide 31 of 52

9 weeks, 2 days

From The Biology of Prenatal Development.Buy Now

Note:

Swallowing amniotic fluid begins at about nine weeks following fertilization. The mouth is officially open for business.

Label Key:

1. lower lip
2. tongue
3. upper lip
4. roof of mouth
All ages referenced to fertilization, not last menstrual period.
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