part of attached to receives synaptic input from neuron salivary pump posterior plate of cibarium rostrum proboscis muscle 13 motor neuron proboscis muscle 13 2022-07-05T13:30:44Z proboscis muscle m13 salivary pump muscle 13 gracilis dorsal salivary muscle A slender muscle that arises on the posterior wall of the cibarium and is attached to the posterior wall of the salivary pump, which it functions in dilating. It is synapsed by the proboscis muscle 13 motor neuron (McKellar et al., 2020). FBbt:00058801 fly_anatomy.ontology rostrum muscle