Thymic Corpuscles

Figure 1-72

Valve of Lymphatic Vessel One-way flow of lymph, from left to right in this figure, is ensured by valve action in lymph vessel. Vessels themselves are thin walled and lack musculature; pumping action occurs through compression by neighboring muscles. (X25)

Valve

Figure 1-72

Valve of Lymphatic Vessel One-way flow of lymph, from left to right in this figure, is ensured by valve action in lymph vessel. Vessels themselves are thin walled and lack musculature; pumping action occurs through compression by neighboring muscles. (X25)

Valve

Bone Tissue X10

Figure 1-73a

Thymus Various lobules contain thick, darkly staining cortex surrounding a smaller, lighter-staining medulla. Small, round cellular patches in medulla are Hassall's corpuscles. In adults, much of thymus degenerates and is replaced by adipose tissue. (X10)

Cortex Medulla

Hassall's corpuscle

Figure 1-73a

Thymus Various lobules contain thick, darkly staining cortex surrounding a smaller, lighter-staining medulla. Small, round cellular patches in medulla are Hassall's corpuscles. In adults, much of thymus degenerates and is replaced by adipose tissue. (X10)

Cortex Medulla

Hassall's corpuscle

Barr Corpuscle

Figure 1-73b

Thymus Under higher magnification, the appearance of Hassall's corpuscles distinguish the thymus from other organs. Surrounding the corpuscles are reticulate epithelial cells. (X400)

Hassall's (thymic) corpuscles

Hassall's (thymic) corpuscles

Thymic Corpuscles

Histology

Pharyngeal Tonsil Capsule Histology

Figure 1-74

Palatine Tonsil Outer capsule surrounds subcapsular sinus, under which are several large, rounded germinal centers surrounding trabecular arteries and veins. Efferent lymph vessel leads out to upper left. (X5)

Lymph vessel Germinal center

Figure 1-74

Palatine Tonsil Outer capsule surrounds subcapsular sinus, under which are several large, rounded germinal centers surrounding trabecular arteries and veins. Efferent lymph vessel leads out to upper left. (X5)

Lymph vessel Germinal center

Spleen Central Artery

Figure 1-75

Spleen Central blood vessels are surrounded by area of densely staining white pulp composed of lymphoid cells. Less densely staining red pulp, with fewer cell nuclei, surrounds white pulp. (X25)

Blood vessel White pulp Red pulp

Figure 1-75

Spleen Central blood vessels are surrounded by area of densely staining white pulp composed of lymphoid cells. Less densely staining red pulp, with fewer cell nuclei, surrounds white pulp. (X25)

Blood vessel White pulp Red pulp

Alveoli And Surface Area

Figure 1-76

Alveoli Thin-walled respiratory exchange surfaces aid in rapid diffusion of gases. Bronchiole terminates at atrium, which acts as entryway into several individual alveoli, greatly multiplying surface area. (X50)

Figure 1-76

Alveoli Thin-walled respiratory exchange surfaces aid in rapid diffusion of gases. Bronchiole terminates at atrium, which acts as entryway into several individual alveoli, greatly multiplying surface area. (X50)

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