The laws and mechanics of circulation, with the principle involved in animal movement . ctions appertain-ing to the viscera themselves in connection with their specialf unctions, or the same as obtains in warm-blooded , for effecting coordination with respiration, we havethe nerves proceeding to the several parts from the spinalmedulla (Fig. 192), inclusive of the heart and vessels, all theparts being fully coordinated for producing a balance in force,the same as in all the animals, and must be so, in the nature ofthings ; the thoracic duct (c) coursing upon the aortse to reacht
The laws and mechanics of circulation, with the principle involved in animal movement . ctions appertain-ing to the viscera themselves in connection with their specialf unctions, or the same as obtains in warm-blooded , for effecting coordination with respiration, we havethe nerves proceeding to the several parts from the spinalmedulla (Fig. 192), inclusive of the heart and vessels, all theparts being fully coordinated for producing a balance in force,the same as in all the animals, and must be so, in the nature ofthings ; the thoracic duct (c) coursing upon the aortse to reachthe chyle receptacles (5, b) and veins at the root of the neck be-ing alike included, so that when the animal locomotes, ner-vous force throbs over all the structures for increasing circu- 422 IN CIIELoNlA. lation correspondingly for maintaining a balance in the organ-ism ; otherwise impossible. This gives ns the respiratory action. Now, then, in regardto the throat-apparatus and the special role it performs inrespiration, the importance of which it would be difficult to. Fig. 173.—The Viscera in the Tortoise (Emys Europcea), as viewed from above.—Bojanus. Z, Z, lungs ; I, liver ; 7, oesophagus ; E, trachea ; F, F, axillary arteries;6, chyle receptacle at the root of the neck, one for either side ; i, jugular vein ; h,brachial vein ; X, urinary bladder ; o, kidney ; H, urethra ; V, V, intestines ; U, U,anal bursa} ; C, thoracic duct. overestimate, being essential to life. Briefly, it consists as fol-lows : The body of the hyoid bone projects from its sides threepairs of long, curved, rib-like processes (Fig. 192, d), which areoperated by muscles connecting with the mandible and base ofthe skull, similar to what obtains in the frog, but much morepowerful, the whole inclosed by the muscular sheath {latissi- IJST CHELONIA- 423 mus colli (Fig. 172, 21, 25) expanded over it, connecting with themandible and base of the skull, imparting the rotund appear-a
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
