part of receives synaptic input from neuron muscle cell ISN innervated muscle of A1-7 ISN innervated muscle cell of A1-7 2013-01-15T04:36:29Z internal muscle cell The classification of muscles as SN, ISN or TN innervated is based not only on innervation, but also orientation (and presumed function), specification pathways during development (wingless dependendence for SN and TN innervated muscles) and the muscle's location in the internal or external layers (although there are exceptions to this) (Landgraf et al., 1997). fly_anatomy.ontology Any muscle cell (FBbt:00005074) that is part of some ISN innervated muscle of A1-7 (FBbt:00059129). FBbt:00110215 larval A1-7-innervating ISN motor neuron hypodermal muscle cell of A1-7