File:Hand-book of physiology (1892) (14742202646).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 156.—Kamification of nerves and terminationin the muscular coat of a small artery of thefrog. (Arnold.) oh. vi.) STRUCTURE OF CAPILLARIES. 18$ The Capillaries. Distribution.—In all vascular textures except some parts of thecorpora cavernosa of the penis, and of the uterine placenta, andof the spleen, the transmission of the blood from the minutebranches of the arteries to the minute veins is effected through anetwork of capillaries. They may be seen in all minutely injectedpreparations. The point at which the arteries terminate and the minuteveins commence, cannot be exactly defined, for the transition isgradual; but the capillary network has, nevertheless, this pecu-liarity, that the small vessels which compose it maintain the
Text Appearing After Image:
Fig. T57.—Capillary blood-vessels from the omentum of rabbit, showing the nucleatedendothelial membrane of -which they are composed. (Klein and Noble Smith.) same diameter throughout: they do not diminish in diameterin one direction, like arteries and veins; and the meshes of thenetwork that they compose are more uniform in shape and sizethan those formed by the anastomoses of the minute arteries andveins. Structure.—This is much more simple than that of the arteriesor veins. Their walls are composed of a single layer of elongatedor radiate, flattened and nucleated cells, so joined and dovetailedtogether as to form a continuous transparent membrane (fig. 157).Outside these cells, in the larger capillaries, there is a structure-less or very finely fibrillated membrane, on the inner surface ofwhich they are laid down. In some cases this external membraneis nucleated, and may then be regarded as a miniature representa-tive of the tunica adventitia of arteries. Here and there, at thej

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