VO4/5 motor neuron [FBbt_00110285]
Motor neuron that develops from the neuroblast NB7-1 lineage. It innervates the internal ventral oblique muscles 4 and 5, which are found in larval abdominal segments A1 to A7. Its dendritic arborization occupies the medial domain of the ventral nerve cord neuropil. It exits the ventral nerve cord via the anterior root of the intersegmental nerve, fasciculating with the ISNd nerve branch and it innervates the VO4 and VO5 muscles via intermediate-sized type I boutons (Hoang and Chiba, 2001; Banerjee et al., 2016). These neurons (at least in A1 to A4) die during metamorphosis (Banerjee et al., 2016). Following Landgraf et al., 1997, larval motor neurons are named according to the muscle they innervate. The same caveats therefore apply regarding inference of serial homology from nomenclature as for the muscles: Following Bate (1993), larval hypodermal muscles are named for their orientation and numbered based on their order from dorsal to ventral or anterior to posterior. So, except where musculature is essentially identical between segments (as for A1-7, with a couple of exceptions for A1), serial homology should not be assumed on the basis of a shared name. There is little or no published literature specifically on innervation in A1 and so where equivalent muscles are present between A1 and A2-7 (Landgraf et al., 1997; Schmid et al., 1999), we infer A1 motor neuron innervation patterns from those of A2-7.
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VFB Term Json
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