. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. ELECTRIC ORGANS 147. Jl- TM- Monnyridse, for example, there is on each side an vipper and lower row of electric organs. The electric apparatus in all the above-named Fishes is to be regarded from the same point of view both as concerns its mode of development and its anatomical relations : all electric organs are to be looked upon as consisting of metamor- phosed muscular fibres and the nerve-endings belonging to them as homologues of theraotor end-plates which are ordinarily found on muscles. As regards the structure
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. ELECTRIC ORGANS 147. Jl- TM- Monnyridse, for example, there is on each side an vipper and lower row of electric organs. The electric apparatus in all the above-named Fishes is to be regarded from the same point of view both as concerns its mode of development and its anatomical relations : all electric organs are to be looked upon as consisting of metamor- phosed muscular fibres and the nerve-endings belonging to them as homologues of theraotor end-plates which are ordinarily found on muscles. As regards the structure of the elec- tric organs, tlie same essential arrange- ments are met with in all: the details of their histology ami physiology cannot be entered into here. The framework is formed of fibrous tissue en- closing numerous cells, which, running partly longitudinally, partly transversely through the organ, gives rise to numerous poly- gonal or more or less rounded chambers or compartments. These latter are arranged in rows, either along the longitudinal axis of the body (Gymnotus, Malopterurus) or in a dorso-ventral direction (Torpedo), forming definite prismatic columns (Fig. 120). Numerous vessels and nerves ramify in the connective-tissue lying between these compartments, the nerves being enclosed in thick sheaths, and having a different origin in the different forms. In Torpedo, in which the electric organs probably arise muscle of the mandible. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
