VA2 motor neuron [FBbt_00110255]
Larval motor neuron that innervates the external ventral acute muscle 2 (muscle 27) via a type Ib bouton (Zarin et al., 2019). Muscles referred to as VA2 exist in segments A1 to A7 (Bate, 1993). The neuron exits the ventral nerve cord via the segmental nerve root, fasciculating with the SNc nerve branch (Landgraf et al., 1997). It has its soma in the same segment as the muscle it innervates (Kohsaka et al., 2012). 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.
Note
This page displays the raw VFB json record for this term. Please use the link below to open the term inside the Virtual Fly Brain viewerExample Images
VFB Term Json
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