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Other Systems — WEEK 20

At approximately day 1

Normal fetal weight: 460 gm

Reference

Moore KL, Persaud TVN. 1998. The Developing Human: Clinically Oriented Embryology. 6th ed. Philadelphia: WB Saunders Co.

At approximately day 1

Stratified squamous epithelium replaces ciliated columnar epithelium in esophagus.

Duration: 5 weeks

Reference [PubMed Link]

Montgomery RK, Mulberg AE, Grand RJ. 1999. Development of the human gastrointestinal tract: twenty years of progress. Gastroenterology 116(3):702-731.