A1-7 DA2 motor neuron [FBbt_00002311]

Motor neuron that innervates the internal dorsal acute muscle 2 of larval abdominal segments A1 to A7 (Landgraf et al., 1997). Its dendritic arborization occupies the lateral and intermediate domains of the ventral nerve cord neuropil. It exits the ventral nerve cord via the anterior root of the intersegmental nerve and innervates the DA2 muscle with type Ib boutons (Landgraf et al., 1997; Hoang and Chiba, 2001). The muscle it innervates is one segment posterior to its soma (Zarin and Labrador, 2019). 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. This motor neuron is an exception to the class of motorneurons that innervate the internal dorsal muscles whose dendrites occupy the lateral neuropil; it has dendrites in the intermediate and lateral regions (Mauss et al., 2009). Based on cell body position, the DA2 motor neuron appears to correspond to the U2 neuron (personal communication by Matthias Landgraf - FBrf0221138), however, Zarin et al. (2019) report that the DA2 motor neuron corresponds to U3.

Open A1-7 DA2 motor neuron in VFB

VFB Term Json

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            "short_form": "FBbt_00002311",
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        "comment": [
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