The laws and mechanics of circulation, with the principle involved in animal movement . causethe secretions to flow out at one and the same time with thebile, and, like it, also flowing from high to low pressure, sincethe churning action in the duodenum connected with its func-tions must inevitably determine low pressure around the ter-minal duct with every expansion in the gut. Then, again, thechurning action in the stomach itself should effect changes ofpressure in the gland for promoting the discharge of the secre-tions. 232 AUTOMATISM IN THE PANCREAS. Finally, we have to mention the automa
The laws and mechanics of circulation, with the principle involved in animal movement . causethe secretions to flow out at one and the same time with thebile, and, like it, also flowing from high to low pressure, sincethe churning action in the duodenum connected with its func-tions must inevitably determine low pressure around the ter-minal duct with every expansion in the gut. Then, again, thechurning action in the stomach itself should effect changes ofpressure in the gland for promoting the discharge of the secre-tions. 232 AUTOMATISM IN THE PANCREAS. Finally, we have to mention the automatism in thegland cells and discharging ducts, without which nothingcould be accomplished in the secretory processes ; while thisin turn is connected with the action in the gut by means ofthe special nerves and ganglia for unifying and coordinatingthe movements, the same as the liver and bile ducts, wherebyuniformity is produced throughout, otherwise impossible ; thepancreatic secretions being controlled by sensory impressionsin the mucous membrane, produced by the food, the same as. Fig. 87.—Pancreas and its Relations.—Gray. the hepatic, and salivary glands with which it is homologous,the structure being the same or racemose. All of which isplain enough. Concerning the Action in the Spleen.—That the spleen pos-sesses certain powers of expanding and contracting in connec-tion with the functions in the organ, there is small room fordoubt, for the following reasons—namely: 1. The investingcapsule forming the framework of the oraan (giving off thecords or trabecular, in which the parenchyma or splenic pulp issituated—being traversed and inclosed by the trabecular—and PHYSIOLOGICAL ANATOMY OF THE SPLEEN. 233 passing in at the hilus with the vein and artery, incloses themalso) is homologous with arterial structure, being composedof fibro-elastic tissue and muscles. Elastic tissue fibres areabundantly intermixed with connective tissue fibres in theouter or external portion
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