The laws and mechanics of circulation, with the principle involved in animal movement . producingthe innumerable local actions connected with the lips, thenumerous radiating bundles and fasciculi apply. But in thesecases the action is limited to the special localities, in which agiven portion of the orbicularis, in conjunction with the mus-cle proceeding from it, is affected. And since we know that 482 DUALISM DEMONSTRATED. nervous action may be limited to a part of a muscle only, thecomprehensive arrangement which obtains here is somethingbeautiful to look upon. The great mobility in the lips
The laws and mechanics of circulation, with the principle involved in animal movement . producingthe innumerable local actions connected with the lips, thenumerous radiating bundles and fasciculi apply. But in thesecases the action is limited to the special localities, in which agiven portion of the orbicularis, in conjunction with the mus-cle proceeding from it, is affected. And since we know that 482 DUALISM DEMONSTRATED. nervous action may be limited to a part of a muscle only, thecomprehensive arrangement which obtains here is somethingbeautiful to look upon. The great mobility in the lips is un-doubtedly due to the number and variety of the local actions,which are swiftly changed and blended upon occasion by meansof the nerves for operating and coordinating the the simple act of nursing, for example, it requires greatmobility in the lips for effecting coaptation with the nipple andproducing the movements concerned in sucking; also, asorgans of prehension in taking solid food. While to this,again, must be added the functions connected with oral sounds,. Fig. 200.—Muscular Structure of the Iris of a White Rabbit.—Carpenter, a, Sphincterof the pupil ; b, 6, radiating fasciculi of dilator muscle ; c, c, connective tissue withits corpuscles. and as channels for announcing the emotions. Varied as arethe uses, then, the numerous adjustments which obtain in thelips would not seem excessive ; nor the grouping of the radi-ating fibres into separate muscular bundles be deemed strange,the matter being altogether different from the simpler actionin the iris, in which the radiating fibres form a uniform layerfor producing the action in the screen concerned in openingand closing the pupil. At the same time, it is equally mani-fest that the same mechanical principle applies for producingthe movements. We pass rapidly over this anatomy, the object being toshow the principle in the mechanics simply, leaving the DUALISM DEMONSTRATED. 483 student to follow it at
Size: 1594px × 1568px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
