File:Kirkes' handbook of physiology (1907) (14583071160).jpg

Identifier: kirkeshandbookof00kirk (find matches)
Title: Kirkes' handbook of physiology
Year: 1907 (1900s)
Authors: Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects: Physiology
Publisher: New York, W. Wood and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Fig. 148.—Network of Capillary Vessels of the Air Cells of the Horses Lung Magnified, a, a.Capillaries proceeding from b, b, terminal branches of the pulmonary artery. (Frey.) in the perforated and streaked appearance which it presents under the micro-scope. The inner surface of the artery is lined with a delicate layer of elon-gated endothelial cells, figure 145, e, which make it smooth and polished andfurnish a nearly impermeable surface along which the blood may flow withthe smallest possible amount of resistance from friction. THE CAPILLARIES 151 Nerves. Most of the arteries are surrounded by a plexus of nerves ornerve fibers, which twine around the vessel. The smaller arteries also havea delicate network of similar nerve fibers many of which appear to end nearthe nuclei of the transverse muscular fibers. The Capillaries. In all vascular textures, except some parts ofthe corpora cavernosa of the penis, of the uterine placenta, and of the spleen,
Text Appearing After Image:
Fig. 149.—Capillaries of Striated Muscular Tissue. From a cat. Magnified 300 diameters.(Heitzmann.) .4, Artery; V, vein. the transmission of the blood from the minute branches of the arteries to theminute veins is effected through a network of capillaries. They may beseen in all minutely injected preparations. The point at which the arteries terminate and the capillaries commencecannot be exactly defined, for the transition is gradual. The capillariesmaintain essentially the same diameter throughout. The meshes of thenetwork that they compose are more uniform in shape and size than thoseformed by the anastomoses of the minute arteries and veins. 152 THE CIRCULATION OF THE BLOOD The walls of the capillaries are composed of a single layer of elongatedor radiate, flattened and nucleated endothelial cells, so joined and dove-tailed together as to form a continuous transparent membrane, figure 147.Outside these cells in the larger capillaries there is a structureless supportingmembrane o

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