Esophagus Histology

Figure 1-77

Details of Alveolus Squamous cells compose alveolar wall, which is bordered by thin-walled blood vessels (upper left) containing erythrocytes. (X100)

Blood vessels Free alveolar macrophage Erythrocyte Simple squamous epithelium

Figure 1-77

Details of Alveolus Squamous cells compose alveolar wall, which is bordered by thin-walled blood vessels (upper left) containing erythrocytes. (X100)

Blood vessels Free alveolar macrophage Erythrocyte Simple squamous epithelium

Macrophage Containing Erythrocyte

Figure 1-78

Bronchiole Epithelial layer that lines the lumen is surrounded by layer of smooth muscle, which regulates bronchiolar diameter. Round structures outside of smooth muscle layer are blood vessels. (X100)

Blood vessel Smooth muscle Lumen Epithelium

Figure 1-78

Bronchiole Epithelial layer that lines the lumen is surrounded by layer of smooth muscle, which regulates bronchiolar diameter. Round structures outside of smooth muscle layer are blood vessels. (X100)

Blood vessel Smooth muscle Lumen Epithelium

Blood Vessel Structure

Figure 1-79

Esophagus Surrounding the lumen, esophageal structure contains, in order, the four basic layers of the alimentary canal: mucosa (composed of epithelium, the thick lamina propria, and dark muscularis), submucosa (light with spaces, blood vessels and lymph channels), two thick layers of the muscularis (circular and longitudinal), and the thin, connective adventitia on the surface. Cross section, human. (X3)

Lumen Mucosa Submucosa Adventitia Muscularis

Cross Section Histology Esophagus

Histology

Gastric Layers

Figure 1-80a

Stomach Mucosa Visible at entrances to gastric pits are mucus-secreting goblet cells of columnar epithelium. Deeper in pits are acid-secreting parietal cells and enzyme-secreting chief cells. Endocrine-secreting cells near tip of pits are noncolumnar and smaller, with dark, round nuclei. Gastric pits penetrate deep into submucosal layer. Edge of muscularis layer is visible. ( X50)

Gastric pits Endocrine cells Goblet cells Parietal cells Chief cells

Figure 1-80a

Stomach Mucosa Visible at entrances to gastric pits are mucus-secreting goblet cells of columnar epithelium. Deeper in pits are acid-secreting parietal cells and enzyme-secreting chief cells. Endocrine-secreting cells near tip of pits are noncolumnar and smaller, with dark, round nuclei. Gastric pits penetrate deep into submucosal layer. Edge of muscularis layer is visible. ( X50)

Gastric pits Endocrine cells Goblet cells Parietal cells Chief cells

Enzyme Secreting Cells

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