A1-7 dorsal motor neuron [FBbt_00002207]
Motor neuron that innervates the internal dorsal acute, dorsal oblique and LL1 muscles of larval abdominal segments A1 to A7 (Landgraf et al., 2003). It exits the ventral nerve cord via the posterior root of the intersegmental nerve. It is one of the common exciters of the A1-7 muscles, innervating the dorsal and LL1 muscles via type Is boutons (Mauss et al., 2009). It receives input from the ipsilateral larval A02b, A27j, eIN-4 (A03a1) and A27e and contralateral larval A08e1-3 local neurons and A31k neuron. Unlike other ISN neurons, its soma is located in the same segment as the muscles it innervates (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. These neurons were identified in one EM reconstruction of abdominal segment 3 of a 12-24h old first instar larva (Heckscher et al., 2015; Schneider-Mizell et al., 2016). For Heckscher et al. (2015) only bilateral connections are reported. The number of identified input synapses was the following (number in brackets left/right): from A08e1 (1-4/1-7), A08e2 (1-4/1-7), A08e3 (1-4/1-7) (Heckscher et al., 2015). For Schneider-Mizell et al. (2016), the number of connections was estimated from the publication figures. The number of input synapses was the following (number in brackets left/right where available): from A02b (12/12), A27j (12/25), A03a1 (20/23), A27e (21), A31k (35/35) (Schneider-Mizell et al., 2016).
Note
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VFB Term Json
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