. Elementary physiology. Physiology; Physiology. Fig. 46.—Muscular 'fibres from the heart, magnified, showing their cross-striae, divisions,! and junctions. (Schweig- ger-Seidel.) The nuclei and cell-junctions are only represented on the right-hand side of the figure. Fjg. 47.—Six muscular fibre cells from the heart. (Magnified 425 diameters.) a, line of junction between two cells ; 3, c, branching of cells. (From a drawing by J. E. Neale.) The different kinds of muscular tissue also vary in the manner of their response on excitation. Under normal con- ditions in the body, skeletal muscle neve
. Elementary physiology. Physiology; Physiology. Fig. 46.—Muscular 'fibres from the heart, magnified, showing their cross-striae, divisions,! and junctions. (Schweig- ger-Seidel.) The nuclei and cell-junctions are only represented on the right-hand side of the figure. Fjg. 47.—Six muscular fibre cells from the heart. (Magnified 425 diameters.) a, line of junction between two cells ; 3, c, branching of cells. (From a drawing by J. E. Neale.) The different kinds of muscular tissue also vary in the manner of their response on excitation. Under normal con- ditions in the body, skeletal muscle never contracts except when excited to do so by nerve impulses, which travel to it along the motor (efferent) nerve fibres. The involuntary muscle fibres which line the intestine, and those lying in the substance of the spleen, on the other hand, continue to contract rhythmically even after they have been severed from all their nerve connections. The same is true of heart muscle, for, not only will the entire heart of a cold-blooded animal, such as the ^ An oval nucleus is seen in the involuntary muscle cells of the muscular coats of the small intestine, and a rod-shaped nucleus in the muscular coats of the larp-er 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 Moore, Benjamin, 1867?-1922. New York: Longmans, Green, and Co.
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