A1-7 lateral VUM motor neuron [FBbt_00002255]

Neuromodulatory motor neuron that innervates the lateral transverse muscles of larval abdominal segments A1 to A7 via type II boutons. It exits the ventral nerve cord via the segmental nerve and fasciculates with the SNa segmental nerve branches. These neurons have a virtually identical arborization pattern, shared with the dorsal and ventral VUM neurons of A1-7. They arborize along and dorsal to the dorsal median fascicle and laterally along the dorsal lateral fascicle, invading the next anterior neuromere. In the dorsomedial neuropil, arborizations are sent into at least two (usually three) anterior neuromeres and the adjacent posterior neuromere (Selcho et al., 2012). 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. In A2-7, these might also synapse to muscles 26 (VA1), 27 (VA2) and 29 (VA3) (Selcho et al., 2012).

Open A1-7 lateral VUM motor neuron in VFB

VFB Term Json

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            "short_form": "FBbt_00002255",
            "label": "A1-7 lateral VUM motor neuron"
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        "description": [
            "Neuromodulatory motor neuron that innervates the lateral transverse muscles of larval abdominal segments A1 to A7 via type II boutons. It exits the ventral nerve cord via the segmental nerve and fasciculates with the SNa segmental nerve branches. These neurons have a virtually identical arborization pattern, shared with the dorsal and ventral VUM neurons of A1-7. They arborize along and dorsal to the dorsal median fascicle and laterally along the dorsal lateral fascicle, invading the next anterior neuromere. In the dorsomedial neuropil, arborizations are sent into at least two (usually three) anterior neuromeres and the adjacent posterior neuromere (Selcho et al., 2012)."
        ],
        "comment": [
            "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. In A2-7, these might also synapse to muscles 26 (VA1), 27 (VA2) and 29 (VA3) (Selcho et al., 2012)."
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