. Elementary entomology . abc Fig. 41. Muscles of cockroach, of ventral, dorsal, and lateral walls, respectively «, alary muscle : abc, abductor of coxa ; adc, adductor of coxa ; h, longitudinal sternal; //, longitudinal tergal; ////, longitudinal thoracic ; os, oblique sternal; ts, tergo-sternal; ts^, first tergo-sternal. (After Miall and Denny) muscles of each segment are very similar, forming segmented bands on the inside of the body wall. The longitudinal muscles beneath the tergum and above the sternum are arranged so that, when they contract, the body bends in that direction, and by thei
. Elementary entomology . abc Fig. 41. Muscles of cockroach, of ventral, dorsal, and lateral walls, respectively «, alary muscle : abc, abductor of coxa ; adc, adductor of coxa ; h, longitudinal sternal; //, longitudinal tergal; ////, longitudinal thoracic ; os, oblique sternal; ts, tergo-sternal; ts^, first tergo-sternal. (After Miall and Denny) muscles of each segment are very similar, forming segmented bands on the inside of the body wall. The longitudinal muscles beneath the tergum and above the sternum are arranged so that, when they contract, the body bends in that direction, and by their rhythmic contraction the looping walk of the caterpillar is produced. Oblique-sternal muscles bend the abdomen laterally, and vertical muscles draw the tergum and sternum together in expiration. The thorax of adult insects is filled with the strong muscles which operate the wings and legs, and the muscles which operate the mouth-parts occupy the back of the head.
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
