The human face starts as a series
of paired tissue mounds called branchial arches.
During embryotic development, the face forms
from the first branchial arch along with the
area just above it. At 28 days of development,
the lower jaw has fused together from the branchial
arches. The nostrils start to form by day 21
and the eyes appear on each side of the head.
2 days later, the nostrils move toward the center
of the face and the ears begin to form.
At 35
days, the nostrils are closer together and
more of the eyes can be seen. At 40 days, the
eyelids have developed and the nose begins to
take its form. At 48 days, the nasal swellings
have joined in the center of the face and the
eyes have moved to the front of the head. 3 weeks
later, the fetal face takes on its human appearance.
The face continues to develop more typical proportions
right up until the time of birth.
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