part of receives synaptic input from neuron haustellum proboscis muscle 8 motor neuron haustellum muscle proboscis muscle 8 2022-07-05T13:30:44Z fly_anatomy.ontology FBbt:00058795 proboscis muscle m8 haustellum muscle 8 A transversely oriented muscle located in the haustellum that inserts on the wall of the pharynx and is positioned to open the pharynx as it contracts (McKellar et al., 2020). It is synapsed by the proboscis muscle 8 motor neuron (McKellar et al., 2020). transverse muscle of haustellum transverse labial muscle adult pharynx muscle