part of ventral transverse muscle cell muscle cell larval external muscle cell ventral transverse muscle 1 muscle cell of ventral transverse muscle 1 2013-01-18T02:47:33Z FBbt:00110280 Any muscle cell (FBbt:00005074) that is part of some ventral transverse muscle 1 (FBbt:00059147). VT1 muscle cell fly_anatomy.ontology Following Bate (1993), larval hypodermal muscles are named for their orientation and numbered based on their order from dorsal to ventral or anterior to posterior. So, except where musculature is essentially identical between segments (as for A1-7, with a couple of exceptions for A1), serial homology should not be assumed on the basis of a shared name.