Figure 164

Photomicrograph of an esophageal submucosal gland. This photomicrograph shows a mucicarmine-stained section of the esophagus. An esophageal gland, deeply stained red by the carmine, and an adjacent excretory duct are seen in the submucosa. These small, compound, tubuloalveolar glands produce mucus that lubricates the epithelial surface of the esophagus. Note the stained mucus within the excretory duct. The remaining submucosa consists of irregular dense connective tissue. The inner layer of the muscularis externa (bottom) is composed of circularly arranged smooth muscle. xllO.

The stomach is an expanded part of the digestive tube that lies beneath the diaphragm. It receives the bolus of macerated food from the esophagus. Mixing and partial digestion

• Cardiac region (cardia), the part near the esophageal orifice, which contains the cardiac glands (Fig. 16.6)

• Pyloric region (pylorus), the part proximal to the pyloric sphincter, which contains the pyloric glands

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