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The walls of capillaries are composed of a single layer of elongated or radiate, flattened and nucleated cells, so joined and dovetailed together as to form a continuous transparent membrane.

Capillaries Showing Nucleated Endothelial Membrane

The walls of capillaries are composed of a single layer of elongated or radiate, flattened and nucleated…

Diagrammatic representation of a capillary seen from above and in section. Labels: a, the wall of the capillary with, b, the nuclei; c, nuclei belonging to the connective tissue in which the capillary is supposed to be lying; d, the canal of the capillary.

Diagram of a Capillary

Diagrammatic representation of a capillary seen from above and in section. Labels: a, the wall of the…

Capillary blood vessel of the tail of a young larval frog. a, capillaries permeable to blood; b, fat granules attached to the walls of the vessels, and concealing the nuclei; c, hollow prolongation of a capillary ending in a point; d, a branching cell with nucleus and fat granules; it communicates by three branches with prolongation of capillaries already formed; e, blood corpuscles still containing granules of fat.

Capillary Blood Vessels of Larval Frog

Capillary blood vessel of the tail of a young larval frog. a, capillaries permeable to blood; b, fat…

The capillary network of the pulmonary blood vessels in the human lung.

Capillary Network in Lung

The capillary network of the pulmonary blood vessels in the human lung.

The form of the capillary network presents considerable variety in the different textures of the body: the varieties consists principally of modifications of two chief kind of mesh, the rounded and the elongated. The kind in which the meshes or interspaces have a roundish form is the most common, and prevails in those parts which the capillary network is most dense, such as the lungs. Shown is the network of capillary vessels of the air cells of the horse's lung magnified. Labels: a, capillaries proceeding from b, terminal branched of the pulmonary artery.

Capillary Vessels of Air Cells

The form of the capillary network presents considerable variety in the different textures of the body:…