A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . he hepatic veinsarise. These last veins join the inferior vena cava. Strictly speaking, however, there is no special portal circulation.Similar arrangements occur in other animals in different places—e.g., snakes have such a system in their supra-renal capsules, and thefrog in its kidneys. When an artery splits up into fine branches during its course, andthese branches do not form capillaries, but reunite into an arterialtrunk, a rete mirabilc is forme
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A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . he hepatic veinsarise. These last veins join the inferior vena cava. Strictly speaking, however, there is no special portal circulation.Similar arrangements occur in other animals in different places—e.g., snakes have such a system in their supra-renal capsules, and thefrog in its kidneys. When an artery splits up into fine branches during its course, andthese branches do not form capillaries, but reunite into an arterialtrunk, a rete mirabilc is formed, such as occurs in apes and the eden-tata. Similar arrangements may exist on veins, giving rise to venousretici mirabilia. 43. The Heart Muscular Fibres of the Heart.—The musculature of the mammalianheart consists of short (50 to 70 //, man), very fine, transversely striatedmuscular fibres, which are actual uni-cellular elements (Eberth), devoidof a sarcolemma (15 to 25 ^ broad), and usually divided at theirblunt ends, by which means they anastomose and form a net-Avork. (Fig. 17, A, B.) The individual muscle-cells contain in their.