. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. 126 THE CAT. fCHAP. V. the appearance of a number of alternating, exceedingly regular, trans- verse markings, such striation depending on a regular arrangement of alternate parts with different refractive properties. Each striation. Fig. 76.—Striped Muscular Tissue of the Cat, greatly magnified. A. Bundle or fasciculus of fibres. a. Cut end of a fibre. b. A fibre. c. A fibre broken up into its component fibrils. B. A fibre, with parts of two others. The fibre has been split at right a
. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. 126 THE CAT. fCHAP. V. the appearance of a number of alternating, exceedingly regular, trans- verse markings, such striation depending on a regular arrangement of alternate parts with different refractive properties. Each striation. Fig. 76.—Striped Muscular Tissue of the Cat, greatly magnified. A. Bundle or fasciculus of fibres. a. Cut end of a fibre. b. A fibre. c. A fibre broken up into its component fibrils. B. A fibre, with parts of two others. The fibre has been split at right angle to its long axis. One of the clefts. Investing membrane or sarcolemma, seen at a point of rupture. The sarcolemma is twisted, but not broken. Fibrilla of different magnitude (/, g, h,) very greatly enlarged. consists of a central narrow dark line (the septal line), on each side of which is a narrow transparent space (the septal zone), while be- tween the transverse striations is a much larger space (the inter- septal zone), and these larger parts constitute the main substance of the fibre and therefore of the muscle. The appearance, thus pre- sented is that of a number of opaque discs embedded, at regular intervals, in a more translucent substance. Faint indications of longitudinal division may also be detected, and after immersion in alcohol, or a weak solution of chromic acid, each fibre may be broken up into a number of very much more minute ones termed fibrillse (Fig. 76, C), each fibril still presenting the transverse striation. It is, however, by no means sure that each fibre is really made up of naturally distinct fibriUse, since, when treated with much diluted hydrochloric acid each fibre may be broken up into (B d) a number of thin discs, parallel to and coinciding with the transverse striations. In the heart, the fibres are bx^anched. § 3. Muscular contraction (which takes place under certain. Please note that these images are extracted from scanned page image
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectanatomy, bookyear1881
