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Stomodeum definition, a depression in the ectoderm of the oral region of a young embryo, which develops into the mouth and oral cavity. See more. Dictionary.com
During the solid stage of development the endoderm of the gut tube proliferates until the gut is a solid tube. A process of recanalization restores the lumen. Proctodeum and Stomodeum The proctodeum (anal pit) is the primordial anus, and the stomodeum is the primordial mouth.uodenum. The duodenum acquires its C-shaped loop as the stomach rotates. Because of its location at the junction of the foregut and the midgut, branches of both the celiac trunk and the superior mesenteric artery supply the duodenum.