continuous with wing vein L1 humeral crossvein longitudinal vein radial vein 2018-10-23T08:40:37Z Proximal region of the L1, L2 and L3 wing veins prior to branching. It can be further subdivided into proximal, medial and distal parts. This vein contains several fields of sensilla. FBbt:00047863 https://www.ento.csiro.au/biology/drosophila/melanogaster.html?R fly_anatomy.ontology Sometimes referred to as the proximal radius, where the term radius is used to include the full L3 vein (e.g. Bryant, 1975 - FBrf0027793). radius radial sector vein