The laws and mechanics of circulation, with the principle involved in animal movement . showing the folds in themucous membrane.—Gray. chaos in the absence of this law and what it involves. It isneedless to extend the matter. Concerning the Action in the Stomach.—Coming to the stom-ach, the first thing to engage attention is the anatomical dis-positions in the mucous membrane, which contains theorgans of secretion and absorption. In the empty or con-tracted condition of the stomach, the mucuous membrane isthrown into a series of longitudinal folds (Fig. 63), the looseareolar tissue connecting
The laws and mechanics of circulation, with the principle involved in animal movement . showing the folds in themucous membrane.—Gray. chaos in the absence of this law and what it involves. It isneedless to extend the matter. Concerning the Action in the Stomach.—Coming to the stom-ach, the first thing to engage attention is the anatomical dis-positions in the mucous membrane, which contains theorgans of secretion and absorption. In the empty or con-tracted condition of the stomach, the mucuous membrane isthrown into a series of longitudinal folds (Fig. 63), the looseareolar tissue connecting it with the adjacent circular mus- PHYSIOLOGICAL ANATOMY. 197 ?cles, which form a continuous cylinder through the wholelength of the intestinal canal, admitting of this action in themucous membrane, or, rather, compelling it, since it does notpossess the same powers in expansion and contraction as themuscles ; hence, when the organ becomes greatly contracted,as in the empty condition, this folding in the mucous liningoccurs, while in the expanded condition, produced by inges-. Fig. 64.—A Transverse Section through the Fundasof the Stomach in a Child.—, a, cylindrical epithelium ; b, b, peptic tubes ; c, muscalaris mucosas ; d, sub-mucous tissue ; e, circular muscular layer ; g, peritoneum ; h, ganglia of Auerbach. tion, they again apply themselves accurately to the muscles,causing the gland-tubes to stand erect and facilitating circula-tion and secretion correspondingly. The following beautifulcut, by a distinguished German microscopist, will serve forimpressing the matter (Fig. 64). The great relative thicknessof the circular muscles (e) is a conspicuous circumstance, 198 PHYSIOLOGICAL ANATOMY. while the loose areolar tissue is drawn into forcible extensionby the folds in the mucous membrane. Of course, the secre-tions for dissolving the food should be compelled out of thetubes as fast as they are formed ; and looking to the secretoryprocesses in these organs,
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