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Fig. 3. Morphological changes that occur in the eel ventricle during growth. (a,b)
Scanning, (c,d) light and (e,f) transmission-electron microscope images of
small (a,c,e) and large (b,d,f) eels. (a,b) The thickness of the compacta and
that of the trabeculae increases with growth. (c,d) The entire compacta
thickness (arrows) of the small eel is included in c. At the same
magnification, only part of the compacta appears in d. Note the increased
vascularization of the latter. Arrows in d indicate accumulations of collagen;
no such accumulations appear in c. (e,f) Myofibrils are developed at both
ages. Note in f the alignment of the mitochondrial and myofibril axis. L,
lacunary spaces; T, trabeculae; M, mitochondria. Bars, 25 µm (a,b); 25
µm (c,d); 600 nm (e,f).
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