JEB -- Lappin et al. 209 (13): 2535 Figure IG11

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Fig. 11. Transmission electron micrograph of depressor mandibulae sarcomeres at resting (= optimal) length. The sarcomeres are short ( $~$ 1.5 µm) compared to those of typical vertebrate skeletal muscles. The A-band (double-headed arrow) is also proportionately shorter ( $~$ 1.0 µm) so that the relative overlap of thick and thin filaments is similar to that of a typical vertebrate skeletal muscle at L₀. Scale bar, 1 µm.