Artery Cross Section

Figure 1-68a

Arterial Cross Section Single layer of darkly stained cells, the tunica intima lines the lumen. Thick tunica media is composed of canoe-shaped smooth muscle cells. Outer adventitial layer of connective tissue provides elastic support and strength. (X50)

Tunica media Tunica adventitia Lumen Tunica intima

Figure 1-68b

Atherosclerosis Cross section of an artery with advanced atherosclerosis. (X40)

Tunica media Tunica adventitia Lumen Tunica intima

Artery Wall Cross Section

Fatty deposit Artery wall Lumen filled with blood

Figure 1-68b

Atherosclerosis Cross section of an artery with advanced atherosclerosis. (X40)

Fatty deposit Artery wall Lumen filled with blood

Cross Section Artery Histology

Histology

Endothelium Tunica Interna

Figure 1-69

Detail of Arterial Wall Inner endothelial cells of tunica intima (left) lie on a basement membrane. A thin layer of smooth muscle cells and elastic tissue (lamina propria) throws this tunic into folds. The tunica media contains multiple layers of smooth muscle cells regularly arranged. A wavy external elastic membrane separates the tunica media from the adventitia.

Tunica adventitia Tunica media Lamina propria Tunica intima

External elastic membrane

Figure 1-69

Detail of Arterial Wall Inner endothelial cells of tunica intima (left) lie on a basement membrane. A thin layer of smooth muscle cells and elastic tissue (lamina propria) throws this tunic into folds. The tunica media contains multiple layers of smooth muscle cells regularly arranged. A wavy external elastic membrane separates the tunica media from the adventitia.

Tunica adventitia Tunica media Lamina propria Tunica intima

External elastic membrane

Tunica Intima

Figure 1-70

Capillary with Red Blood Cells in Single File

Capillary wall is made of flattened endothelial cells without complex tunics, a simple structure that facilitates the exchange of gases, nutrients, wastes, and hormones. (X400)

Endothelium Red blood cell

Figure 1-70

Capillary with Red Blood Cells in Single File

Capillary wall is made of flattened endothelial cells without complex tunics, a simple structure that facilitates the exchange of gases, nutrients, wastes, and hormones. (X400)

Endothelium Red blood cell

Figure 1-71

Lymph Node Outer cortex containing several follicles surrounds medulla, with its

Figure 1-71

Lymph Node Outer cortex containing several follicles surrounds medulla, with its

Temporal Bone Lymph Nodes

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