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Main Stem Bronchi

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From The Biology of Prenatal Development.

Script: In the respiratory system, the right and left main stem bronchi are present and will eventually connect the trachea, or windpipe, with the lungs.

All ages referenced to fertilization, not last menstrual period.

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4D Ultrasound

The Fetal Period

Main Stem Bronchi

Uterus is Identifiable

Vocal Cords

Sucking and Swallowing

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Movie Theater

Main Stem Bronchi

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9 weeks