. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 172 COMPARATIVE PHYSIOLOGY. muscle; or, long nucleate<l fibers transversely striped, covered with an elastic sheath of extreme thinness, bound together into small bundles by a delicate connective tissue, these again into larger ones, till what is commonly known as a "muscle " is formed. This, in the higher vertebrates, ends in tough, ine- lastic extremities suitable
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 172 COMPARATIVE PHYSIOLOGY. muscle; or, long nucleate<l fibers transversely striped, covered with an elastic sheath of extreme thinness, bound together into small bundles by a delicate connective tissue, these again into larger ones, till what is commonly known as a "muscle " is formed. This, in the higher vertebrates, ends in tough, ine- lastic extremities suitable for attachment to the levers it may be required to move (bones). CJertain of the tissues will Iks found briefly described in the sections preceding "; Comparative.—The lowest animal forms possess the power of movement, which, as we have seen in Amoeba, is a result rather of a groping after food ; and takes place in a direction it is impossible to predict, though no doubt regulated by laws definite enough, if our knowledge were equal to the task of de- fining them. Those ciliary movements among the infusorians, connected with locomotion and the capture of food, are examples of a protoplasmic rhythm of wonderful beauty and simplicity. Muscular tissue proper first appears in the Coelenterata, but not as a wholly independent tissue in all cases. In many coelenterates cells exist, the lower part of which alone forms a delicate muscular fiber, while the superficial portion (myoblaat), composing the body of the cell, may be ciliated and is not con- tractile in any special sense. The non-striped muscle-cells are most abundant among the in- vertebrates, though found in the viscera and a few other parts of vertebrates. This form is plainly the simpler and more primitive. The ^ voliratary muscles are of the Fiu. of ajeiiyfl«h,thejft- gtviped variety in articulates data Aunlia (Claus). /^ ,, . _i v * and some other mvertebrate groups and in all vert
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