The tergal depressor of the trochanter muscles are a bilateral pair of large tubular twitch muscles which, based on their anatomy, could function as wing elevator or leg extensor muscles.
references
Levine, J., & Tracey, D. (1973). Structure and function of the giant motorneuron ofDrosophila melanogaster. Journal of Comparative Physiology, 87(3), 213–235. https://doi.org/10.1007/BF00696043