has characteristic has soma location fasciculates with has synaptic IO in region sends synaptic output to cell mesothoracic neuron adult mesothoracic accessory nerve direct flight muscle motor neuron wing axillary muscle III3 motor neuron III3mn FBbt:00004067 III3_MN VFB:FBbt_00004067 III3_MN fly_anatomy.ontology Motor neuron that innervates the muscle of third axillary III3, ipsilaterally (Trimarchi and Schneiderman, 1994). It has a large tear-shaped soma, found ventral to the root of the accessory mesothoracic nerve, through which its axon leaves the ventral nerve cord, and dorsal to the mesothoracic leg nerve (Trimarchi and Schneiderman, 1994). Within the ventral nerve cord, its neurites are found in the dorsal neuropil, with one branch projecting medially and another running anteriorly through the lateral part of the mesothoracic neuromere (Trimarchi and Schneiderman, 1994). A posterior branch also projects to, and arborizes in, the root of the dorsal metathoracic (haltere) nerve (Trimarchi and Schneiderman, 1994). All of these neurites remain ipsilateral (Trimarchi and Schneiderman, 1994; Ehrhardt et al., 2023). muscle cell of wing axillary muscle III3 adult dorsal metathoracic nerve root adult mesothoracic neuromere cell body rind of adult mesothoracic neuromere unilateral