anatomical space costal wing vein break 2024-05-31T09:49:26Z fly_anatomy.ontology FBbt:00053252 Break in the costal wing vein, which follows the anterior wing margin (McAlpine, 1981). These may give the wing additional flexibility during flight (McAlpine, 1981). McAlpine (1981) describes 3 possible breaks in insect wings, based on figures in Ferris (1950) and Fabian et al. (2016), only humeral and subcostal appear to exist in D. melanogaster.