receives synaptic input from neuron ps1 motor neuron mesothoracic pleurosternal muscle mesothoracic pleurosternal muscle 59 2022-07-05T13:30:44Z ps1 muscle fly_anatomy.ontology FBbt:00058915 The larger of the mesothoracic pleurosternal muscles. It is located dorsally to pleurosternal muscle 60 (Miyan and Ewing, 1985). It is one of only two flight muscles that express doublesex (Shirangi et al., 2013). pleurosternal 1