attached to part of receives synaptic input from neuron adult head capsule rostrum proboscis muscle 1 motor neuron proboscis muscle 1 2022-07-05T13:30:44Z lateral labial adductor muscle Muscle with its origin in the dorso-posterior head capsule and its insertion site in the posterior cuticle of the rostrum, near the posterior end of the apodeme of the rostrum, similar to muscles 2 dorsal and 2 ventral (McKellar et al., 2020). As the three of these contract, they pull the rostrum back into the head cavity (McKellar et al., 2020). It is synapsed by the proboscis muscle 1 motor neuron (McKellar et al., 2020). FBbt:00058787 proboscis muscle m1 retractor of rostrum fly_anatomy.ontology rostrum retractor muscle rostrum muscle