attached to receives synaptic input from neuron wing axillary muscle I1 motor neuron 1st axillary sclerite axillary muscle wing axillary muscle I1 2022-07-05T13:30:44Z first pterale I, I1 muscle of first axillary 53 first muscle of pterale I FBbt:00058909 pa3 m.le.1 fly_anatomy.ontology anterior muscle of first axillary sclerite Direct flight muscle connected to the anterior of the first axillary sclerite that, together with muscle I2, serves to raise the wing and draw it backwards (Miller, 1950). It is innervated by the I1 motor neuron.