The laws and mechanics of circulation, with the principle involved in animal movement . thod. In short, there must be some special reason for theanatomical dispositions that obtain in the arteries as well as inthe veins, for they cannot be purposeless. 3. The great relative size of the veins, which is greatly inexcess of the arteries, the same applying for the trunks of the 234 PHYSIOLOGICAL ANATOMY OF THE SPLEEN. vessels, the splenic vein being a number of times larger thanthe artery ; there must be some reason for this also, for itneither can be purposeless. And there can be but little doubt
The laws and mechanics of circulation, with the principle involved in animal movement . thod. In short, there must be some special reason for theanatomical dispositions that obtain in the arteries as well as inthe veins, for they cannot be purposeless. 3. The great relative size of the veins, which is greatly inexcess of the arteries, the same applying for the trunks of the 234 PHYSIOLOGICAL ANATOMY OF THE SPLEEN. vessels, the splenic vein being a number of times larger thanthe artery ; there must be some reason for this also, for itneither can be purposeless. And there can be but little doubtthat the organ functions as a reservoir for relieving an over-distended portal system, expanding during this time underspecial stimulus, and thus diverting the blood from the liver,and so relieving it. It would account for the elastic tissue fibresand the muscles in the spleen, together with the special arrange-ments in the walls of the veins in the spleen Furthermore,we know the organ does rayjidly increase in size in acutefebrile disorders, from the congestions they produce in the. Fig. 88.—Transverse Section of the Human Spleen, showing the distribution of thesplenic artery and its branches.—Gray. liver and portal system; nor is it possible for this condi-tion to be produced by the action in the vein simply, theorgan absolutely inhibiting it; the walls of the vein yield-ing long before the dense structures in the spleen. Besides,it would involve the whole portal system. It cannot bethought of. The sharp pain in the left side, induced byrunning, has its explanation in an over-distended spleen, theorgan rapidly expanding for relieving a surcharged liver andportal system, thereby pulling upon the nervous filaments andproducing pain, just as an over-distended bladder pioducespain, only the one is more rapidly produced than the other,and the pain sharper. Finally, the simple experiment of MUSCULAR FOECE FOE THE SPLEEN. 235 dipping the spleen into warm water condenses the orga
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