. Kirkes' handbook of physiology . nstriated muscle fibers are elongated, spindle-shaped,mononucleated cells, 7 to 8 ytx in diameter by 40 to 200 fji in length, figures68 and 69. The protoplasm of each cell, the contractile substance, ismarked by longitudinal striations representing fibrils which have beendescribed as contractile. The nucleus is an oblong mass placed near the 58 CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES center of the cell. It is covered by a nuclear membrane which encloses anetwork of anastomosing fibrils. Development. In the pig the smooth muscle of the alimentarycanal
. Kirkes' handbook of physiology . nstriated muscle fibers are elongated, spindle-shaped,mononucleated cells, 7 to 8 ytx in diameter by 40 to 200 fji in length, figures68 and 69. The protoplasm of each cell, the contractile substance, ismarked by longitudinal striations representing fibrils which have beendescribed as contractile. The nucleus is an oblong mass placed near the 58 CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES center of the cell. It is covered by a nuclear membrane which encloses anetwork of anastomosing fibrils. Development. In the pig the smooth muscle of the alimentarycanal originates in the syncytium of the mesodermal cells which surroundthe entoderm. The cells soon begin to grow into the adult spindle-shapeform and the fibrils make their appearance. Even in the adult muscle thesyncytial connections are retained according to Miss McGill. Striated Muscle. Striated or striped muscle constitutes the whole of the muscular apparatusof the skeleton, of the walls of the abdomen, the limbs, etc.—the whole. Fig. 70.—Transverse Section through Muscular Fibers of Human Tongue. The deeply stainednuclei are situated at the inside of the sarcolemma. Each muscle fiber shows Cohnheims is, the sarcouselements in transverse section separated by clear (apparently linear) interstitialsubstance. X 450. (Klein and Noble Smith.)
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