. Anatomy, descriptive and applied. Anatomy. \tropiC Mjcr—ijHiiH If r(<ittJ(»*!/ fi i" fiiHiiivi!.;.'. Primitive jibril \Mxmi\i se line of Briicke Fig. 280.—Two human muscle fibres. X .350. In the one the bundle of fibrilte (6) is torn, and the sarcolemma (a) is seen as an empty tube. ; (fiij xitiuiiiii'X '.'tiiiifuiiiiiiitji; i ii\ i i 1 a Hi f/'lifiij ; (iiiiiiijj'^f'jtJj.'ifJ y jMfiJtntTij'ifiin]'!— ' .(iiJtini iiiijiji'i ituTiuTiJsii'}}'! fiisiKriHi''!!!? r^ , , lljliiillifHilljL-^'""'""^^ membrane ^iliiiisjinjiyi'-'' "^ Fig. 281,—A bit of a cross-striated
. Anatomy, descriptive and applied. Anatomy. \tropiC Mjcr—ijHiiH If r(<ittJ(»*!/ fi i" fiiHiiivi!.;.'. Primitive jibril \Mxmi\i se line of Briicke Fig. 280.—Two human muscle fibres. X .350. In the one the bundle of fibrilte (6) is torn, and the sarcolemma (a) is seen as an empty tube. ; (fiij xitiuiiiii'X '.'tiiiifuiiiiiiitji; i ii\ i i 1 a Hi f/'lifiij ; (iiiiiiijj'^f'jtJj.'ifJ y jMfiJtntTij'ifiin]'!— ' .(iiJtini iiiijiji'i ituTiuTiJsii'}}'! fiisiKriHi''!!!? r^ , , lljliiillifHilljL-^'""'""^^ membrane ^iliiiisjinjiyi'-'' "^ Fig. 281,—A bit of a cross-striated muscle of a frog, show- ing the nucleus and the ease of its division both transversely and longitudinally. X 650. (Szymonowicz and MacCallum.) longitudinal striaiions so typical of the appearance of a longitudinal section of muscle under the microscope. • In a cross-section the fibrillae are arranged more or less in groups called Cohnheim's fields. The fibrillar, or sarcostyle, are not unbroken threads, but all are interrupted at intervals into short segments called sarcous elements. As a result of this segmentation a fibre exhibits alter- nating transverse dark and light bands (cross-striations). If a muscle fibre be examined under high magnification, a light line is seen traversing each dark band (anisotropic); this is the membrane of Hensen. The light band (isotropic) is traversed by a dark line, Dobie's line, or the memjorane of Krause, that divides the band into two parts, the lateral disks. A sarcomere is that part of a fibril between two membranes of Krause, and consists of a sarcous element and a lateral disk at each end of the sarcous element. The nuclei are numerous and are situated peripherally, i. e., just beneath the sarcolemma. They are narrow and elongated in form, and respond readily to the usual stains. Branched fibres are occasionally seen in the tongue. There are two kinds of fibres, red and wltite; the former are rich in sarcoplasm and the nuclei
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
