Development of Digestive System
Sagittal section of embryo at about four weeks showing the primitive gut.
This diagram of the digestive system indicates the thalamencephalon, optic vesicle, stomodeum, ventricle, liver, yolk sac, hind gut, allantois, umbilical artery, body stalk, umbilical vein, cloaca, stomach, bulbus cordus, auditory pit, pharynx, midbrain, and buccopharyngeal membrane.
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"Digestive System."
http://wiki.medpedia.com/Image:Gray977.png?filetimestamp=20090325195903
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