The laws and mechanics of circulation, with the principle involved in animal movement . n. 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 di
The laws and mechanics of circulation, with the principle involved in animal movement . n. 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 organ ; thegalvanic current also ; though by reason of the density of thestructure the action is necessarily slight; hence, there can beno doubt that it also expands. Moreover, the vessels are em-bossed by a dense plexus of nerves connecting with the solarplexus, which at once shows that there must be great activityin the organ ; otherwise, it were all meaningless. The specialanatomy is deeply interesting, but it is difficult to produce. Fig. 89.—Oae of the Splenic Corpuscles, showing its relations with the blood vessels.—G-ray. a, Arterial twig, embracing a Malpighian corpuscle. The terminal branchesof the splenic vein are seen losing themselves in the corpuscle, in which they open a mental picture of it; indeed, altogether impossible, thoughsome general idea may be formed. The lymph follicles, cellsand Malpighian corpuscles are in close and intimate relationswith the arterial vessels, as a matter of course, the arterialcapillaries surrounding them (Fig. 88). The manner in whichthe veins lose themselves in the Malpighian corpuscles, and theintimate relations they sustain to the arterial feeder, are veryforcibly shown in the following beautiful cut (Fig. 89, a). 236 ABSENCE OF VALVES IN THE PORTAL SYSTEM. For the rest, the reader is referred to the literature of the sub-ject and works on histology. The portal system is brought
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