The laws and mechanics of circulation, with the principle involved in animal movement . rcular muscles ; L,longitudinal muscles ; P, peritoneum. anatomical dispositions in the mucous membrane, and the me-chanical adjustments that obtain in the intestine, it followsthat contraction in the muscles must have the effect of forciblycompressing the gland follicles and lymphoid follicles (), and compelling the secretions out of them, gently buteffectually constringing them, and milking them, so to speak, 214 PHYSIOLOGICAL ANATOMY. of their contents by means of the uniform compression ex-ert
The laws and mechanics of circulation, with the principle involved in animal movement . rcular muscles ; L,longitudinal muscles ; P, peritoneum. anatomical dispositions in the mucous membrane, and the me-chanical adjustments that obtain in the intestine, it followsthat contraction in the muscles must have the effect of forciblycompressing the gland follicles and lymphoid follicles (), and compelling the secretions out of them, gently buteffectually constringing them, and milking them, so to speak, 214 PHYSIOLOGICAL ANATOMY. of their contents by means of the uniform compression ex-erted through the elastic air-cushion under the energy in themuscles. Sandwiched as they are between these forces, with the mus-cles as the firm floor of support, the cushion pressing againstthem, it could not otherwise than have this effect upon theglands. It at once settles the matter. The air is in there andit cannot get away, and the muscles certainly contract; therest follows as an inevitable sequence. Xow, then, to thismust be added the tine adjustments in the muscularis mucosae,. Fig. 78.—Section of the Large Intestine of a Rabbit. J, crypts of Lieberkiihn; a,epithelium ; b, mucosa ; m, muscularis : s, submucosa ; R, circular muscularlayer ; L, longitudinal muscular layer ; p, peritoneum.—Verson. and the thing will be complete. It must be borne in mind thatthe viscid secretions are difficult to move ; hence, force must beapplied directly to the follicles, which is done by means ofsmall muscular fasciculi extending from tlie muscularis mu-cosas between the acini of Brunners glands and between thefollicles of Lieberkuhn ; but are much more numerous in thevilli, running upward into the parenchyma, so as to form thewall of the central lacteal (Fig. 98, m, I). This, together with the force in the circular muscles, exertedin the manner as stated, compel Qe secretions out of the fol- PHYSIOLOGICAL ANATOMY. 215 licles. It now remains to take np the work of absorption,f
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