Human Face Formation
(eVideo)

English

Encoded with permission for digital streaming by Infobase on March 14, 2013.

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Development of the face over the first trimester is a fascinating process in which some dramatic changes take place in a short time. During month 1, when the fetus is still an embryo, its face starts as a series of paired tissue mounds called branchial arches. The embryo's face forms from the first branchial arch along with the area above it. The forehead, nose, cheekbones, and mouth form from the area above the first branchial arch. Lower areas will form the lower jaw. At day 28 the lower jaw becomes apparent, as the lower branchial arches fuse. Thickenings above the jaw will eventually form the nostrils. By day 31 the nostrils start to form. Quite remarkably, the eyes appear on each side of the head. Two days later the nostrils move toward the center of the face. As the ears begin to form, they are positioned at first in an odd location on both sides of the lower jaw, but they will move upward. At day 35 the nostrils are closer together, and the eyes become more apparent.

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