. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 196 HISTOGENESIS OF NON-STRIATED MUSCULAR TISSUE through considerable stretches of the syncytium, without regard to the original cell areas. The fibrils multiply, apparently by longitudinal division, and arrange themselves in circles around areas of the syncytium (com- pare Fig. 119). As the multiplication of the fibrils continues those newly formed arrange themselves around the interior of each of the original circles and gradually occupy the entire cytoplasm, or sarco- plasm as it may now b
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 196 HISTOGENESIS OF NON-STRIATED MUSCULAR TISSUE through considerable stretches of the syncytium, without regard to the original cell areas. The fibrils multiply, apparently by longitudinal division, and arrange themselves in circles around areas of the syncytium (com- pare Fig. 119). As the multiplication of the fibrils continues those newly formed arrange themselves around the interior of each of the original circles and gradually occupy the entire cytoplasm, or sarco- plasm as it may now be termed, except immediately around the nuclei where, even in the adult, a certain amount of undifferentiated sarco- plasm persists. The fibrils when first formed are apparently homo-. Fig. 119.—Cross-section of a Muscle prom the Thigh of a Pig Embryo 75 mm. Long. A, Central nucleus; B, new peripheral nucleus.—(Macallum.) geneous, but later they become differentiated into two distinct sub- stances which alternate with one another throughout the length of the fibril and produce the characteristic transverse striation of the tissue. Finally stronger interrupted transverse bands of so-called cement substance appear, dividing the tissue into areas which have usually been regarded as representing the original myoblasts, but are really devoid of significance as cells, the tissue remaining, strictly speaking, a 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 McMurrich, J. Playfair (James Playfair), 1859-1939. Philadelphia : P. Blakiston's son & co.
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