period-positive median segmental interneuron [FBbt_00111047]
Glutamatergic, period-expressing, interneuron of the larval ventral nerve cord whose soma is located near the ventral midline of each segment (Kohsaka et al., 2014; Kohsaka et al., 2019). Its axon projects dorsally toward the dorsal midline, turns laterally and extends toward the lateral edge of the neuropil; it then makes a loop around the DL fascicle and projects back medially (Kohsaka et al., 2014; Kohsaka et al., 2019). Its terminals are mainly found in the dorsal neuropil region of the same segment as its soma (Kohsaka et al., 2014). There are around 10 of these interneurons in each hemineuromere (Kohsaka et al., 2014; Kohsaka et al., 2019), which develop from the NB2-1 neuroblast (Kohsaka et al., 2019; Mark et al., 2021). Kohsaka et al. (2014) and Kohsaka et al. (2019) claim there are only 10 PMSI neurons per hemineuromere (A02a-j). McNamee et al. (2016) - FBrf0232247 and Mark et al. (2021) seem to consider all lineage 2 neurons to be PMSIs (despite some lacking the characteristic dorsal loop).
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VFB Term Json
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