. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 18 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. teristic tissue is the muscular. The characteristic prop- erty of this tissue is contractility under stimulus of any kind, but, normally, under the stimulus of nerve force. Structure.—To the naked eye muscle tissue consists of bundles or fascicles of fibers lying parallel to one an- other; but under the microscope each fascicle is seen to be composed of a multitude of cylindrical fibers trans- versely striated, and under favorable condition
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 18 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. teristic tissue is the muscular. The characteristic prop- erty of this tissue is contractility under stimulus of any kind, but, normally, under the stimulus of nerve force. Structure.—To the naked eye muscle tissue consists of bundles or fascicles of fibers lying parallel to one an- other; but under the microscope each fascicle is seen to be composed of a multitude of cylindrical fibers trans- versely striated, and under favorable conditions these again are separable C into still finer fibrillse. Each fiber is. Fig. 9.—A, muscular fibers of voluntary muscle ; B, one fiber broken to show its investing sheath ; C, cells of involuntary muscle. invested with a thin membrane of connective tissue (Fig. 9). When a muscle contracts the fibers are observed to shorten and thicken' {Y\g. 9, A, B, C). Varieties.—There are two kinds of muscle, voluntary and involuntary. The fibers of the one are transversely striated or minutely wrinkled; the fibers of the other are not thus wrinkled (Fig. 9, C). Of all tissues, muscle is that one in which the original cell structure is most obscured by modification for func- tion. In perfectly formed striated muscle there is no ap-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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