. The American journal of anatomy . Fig. 16 Four adjacent fibers of turtle heart. The discs are superficial, numer-ous, and very like those of bird heart; always at anisotropic levels, usually com-pact and only very rarely in steps. Fig. 17 Cardiac muscle of toad. 9. Frog Practically the same description holds for frog (fig. 18) as fortoad. The important point is the presence of discs in tissuebelow birds, where they have been denied. There appears abso-lutely no evidence here that they mark cell boundaries. 164 H. E. JORDAN AND K. B. STEELE 10. Trout In heart muscle of trout (fig. 19, represe
. The American journal of anatomy . Fig. 16 Four adjacent fibers of turtle heart. The discs are superficial, numer-ous, and very like those of bird heart; always at anisotropic levels, usually com-pact and only very rarely in steps. Fig. 17 Cardiac muscle of toad. 9. Frog Practically the same description holds for frog (fig. 18) as fortoad. The important point is the presence of discs in tissuebelow birds, where they have been denied. There appears abso-lutely no evidence here that they mark cell boundaries. 164 H. E. JORDAN AND K. B. STEELE 10. Trout In heart muscle of trout (fig. 19, representing several levelsof focus), the discs are distinctly fewer in number than in highergroups. Occasionally also the oval type appears as thickenings. 18 \..s Fig. 18 Cardiac muscle of 19 Cardiac muscle of trout.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
