File:Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct - for the use of schools and colleges (1870) (14595979850).jpg

Identifier: outlinesofcompar00agas (find matches)
Title: Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges
Year: 1870 (1870s)
Authors: Agassiz, Louis, 1807-1873 Gould, Augustus A. (Augustus Addison), 1805-1866 Wright, Thomas, 1809-1884
Subjects: Physiology, Comparative Zoology
Publisher: London : Bell & Daldy
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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, sothat the smallest portion of a muscle belong-ing to this system is at once recognized underthe microscope by their presence. The trans-verse stria3, however, become extremely faintunder many circumstances ; in bodies withvery soft or flabby muscles, and in very younganimals, for example; but even here they are often very distinct, and arereadily studied in the living larva of the frog, near to the spinal columnin the tail. They are very distinct in boiled and roasted meat, and inmuscle that has been macerated in spirit (Fig. 61, 62, B), in which, indeed,they often present themselves as absolute transverse rug33, with lateralnotchings, so that we should be very apt to suppose that a peculiar sheathenveloped the muscular bundles, a supposition which gains strength fromthe fact, that towards the torn ends of the specimen, the primitive fibrilsare often seen free, isolated, and without any appearance of cross-barring(Fig. 62, A). On the other hand, however, we frequently recognize the
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CILIARY MOTIONS. CILIARY MOTIONS. (§ 21 G.We have already stated that ciliary motions take placeindependent of either the muscular or nervous systems (§ 211). transverse streaking upon the several isolated primitive fibrils (Fig. 63, A.and B). It would seem that transverse sections ought to supply thesurest grounds for conclusions; but no such thing as a sheath can ever Fig. 61. Fig. 61.—Structureof human muscle ; aportion of the attol-lens auriculas, whichhad been long keptin spirit. A, A num-ber of primary mus-cular fasciculi mag-nified about 200diameters. B, A sin-gle fasciculus morehighly magnified. C,Some fibres of cellu-lar tissue interposedbetween the muscu-lar fasciculi. Fig, 62.—Muscular fibre,after Skey.(Philo8.Trans.1837.) A, Fi-bra Muscularis—primitivemuscular fasci-culus. Supe-riorly the pri-mitive fibresare separatedfrom eachother; the glo-bules are blood-discs to serveas standards forthe estimationof their diame-ter. B, A pri-mitive muscu-lar fibre, to show how

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