Qsx

Larynx

Esophagus

Stomach

Duodenum

Primary intestinal loop

Figure 13.14 A. A 3-mm embryo (approximately 25 days) showing the primitive gastrointestinal tract and formation of the liver bud. The bud is formed by endoderm lining the foregut. B. A 5-mm embryo (approximately 32 days). Epithelial liver cords penetrate the mesenchyme of the septum transversum.

Tongue

Pericardial Û

Septum transversum

Vitelline duct

Allantois

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