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Studies on the histogenesis of the tunica mucosa of the stomach of the Egyptian water buffalo (Bos bubalus L.) III. Histogenesis of the mucosa of the ventricular sulcus (esophageal groove).

In the fetus with 9 cm CRL the ventricular groove was made up of two lips and a floor. The mucosa consisted of a Lamina epithelialis and a Lamina propria mucosae. The basal zone of the Lamina epithelialis was uneven in the floor of the groove and showed wedge-shaped evaginations into the superficial one. The luminal surface of the Lamina epithelialis of the floor became undulant in the fetus with 27 cm CRL. The Lamina muscularis mucosae became evident in the fetus with 73 cm CRL. In this fetal stage the Lamina epithelialis of the floor became differentiated into the Strata basale, spinosum, granulosum and corneum.