. Animal physiology. Physiology, Comparative. STRIATED MUSCULAR FIBRE. has to bring together. The muscular fibre itself consists of a delicate membranous tube, enclosing a great number of Jlbrillce, or extremely minute fibrils, -which are not capable of further division (lig. 20). The peculiar transverse marking. Fi"-. 20.—Striated Musculau Fibri: ;g into Fibrill;e. or striation by which this form of muscular hbre is characterised, is found, when the fibre is separated into its fibrilla), to be due to the pecuhar markings which every fibril presents. These markings, consisting o
. Animal physiology. Physiology, Comparative. STRIATED MUSCULAR FIBRE. has to bring together. The muscular fibre itself consists of a delicate membranous tube, enclosing a great number of Jlbrillce, or extremely minute fibrils, -which are not capable of further division (lig. 20). The peculiar transverse marking. Fi"-. 20.—Striated Musculau Fibri: ;g into Fibrill;e. or striation by which this form of muscular hbre is characterised, is found, when the fibre is separated into its fibrilla), to be due to the pecuhar markings which every fibril presents. These markings, consisting of alternate light and dark spaces, give to the fibril a beaded appearance ; but this is only an optical deception, since its form is in reality cylindrical, or nearly so. It is easy to see how the correspondence of the hght and dark spaces respectively, throughout the whole bundle of the Jihril, will give rise to the banded appearance which the entire fibre presents. The form and diameter of the fibres vary considerably, both in different tribes, and in different parts of the same animal. In the higher classes, their form usually approaches a cyhnder; but the parts which press against one another are somewhat flattened, so that it is more or less prismatic. In Insects, on the other hand, the fibrillae are arranged in flat bands, so that the fibre often consists of but a single layer of them. The diameter of the fibres in Man averages about l-400th of an inch, and does not differ very widely in either direction; in the cold-blooded Yertebrata, however, the average size is greater, and the extremes are also wider; the diameter of the fibres varying in the Frog from 1-lOOth to 1-lOOOth of an inch, and in the Skate from l-65th to l-300th of an inch. The diameter of tho Jibrils is nearly the same in all classes, seldom departing much from 1-10,000th of an inch; and the average distance of the dark strise from each other is nearly the Please note that these images are extrac
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