. Kirkes' handbook of physiology . and is doubly refractive, isotropic, while the surrounding material,the light band, is singly refractive, anisotropic. HEART MUSCLE 61 In transverse section, figure 70, the area of the muscle substance is mappedout into small polygonal areas by a network of clear lines called Cohnheimsareas. The lines represent the substance between the sarcostyles. Thissubstance probably represents the less differentiated contractile substance,called sarcoplasm. In figure 81 the interfibrillar sarcoplasm is indicatedby the longitudinal and transverse lines. Heart Muscle. The
. Kirkes' handbook of physiology . and is doubly refractive, isotropic, while the surrounding material,the light band, is singly refractive, anisotropic. HEART MUSCLE 61 In transverse section, figure 70, the area of the muscle substance is mappedout into small polygonal areas by a network of clear lines called Cohnheimsareas. The lines represent the substance between the sarcostyles. Thissubstance probably represents the less differentiated contractile substance,called sarcoplasm. In figure 81 the interfibrillar sarcoplasm is indicatedby the longitudinal and transverse lines. Heart Muscle. The muscle substance of the heart is composedof mononucleated masses of protoplasm, cardiac muscle cells, in which thesubstance of the cell presents the transversely striated appearance char-acteristic of the voluntary muscle justdescribed. But the heart muscle is phys-iologically much more like an involuntarymuscle. The cells are rather small, twoto four times as long as thick, and the nu-cleus is usuallv situated near the middle of.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
