part of attached to larval abdominal apodeme embryonic/larval intrasegmental apodeme embryonic/larval A1-7 intrasegmental apodeme 1 ina1 Anterior-most of the two intrasegmental apodemes located in each embryonic/larval segment A1-7. It is the site of insertion of A1-7 ventral acute muscles 1 and 2 (also known as vs3 and vs2 respectively). anterior intrasegmental apodeme of abdominal segment fly_anatomy.ontology FBbt:00001021 larval abdominal segment A1-7 A1-7 ventral acute muscle 1 ventral acute muscle 2