larval A02b neuron FBbt_00111664

larval A02b neuron

ID: FBbt_00111664

Larval period-positive median segmental interneuron (PMSI) (Kohsaka et al., 2019 that is late-born in the NB2-1 Notch OFF primary hemilineage (Mark et al., 2021. Like other PMSIs it has a ventral soma and it extends dorsally, close to the midline, then forms a loop in the dorsal neuropil (Kohsaka et al., 2019. This neuron has a relatively large amount of dendritic arborization around the midline, crossing into the contralateral hemineuromere (Schneider-Mizell et al., 2016; Kohsaka et al., 2019. It receives input from the proprioceptors dmd1 (dda1), ddaD and vbp, and outputs onto the ipsilateral A03a1 (eIN-4) (axo-axonic connection) and RP2 motor neuron (Schneider-Mizell et al., 2016. (Kohsaka et al., 2019, Schneider-Mizell et al., 2016, Mark et al., 2021)

These neurons were identified in a EM reconstruction of a volume that includes the posterior half of abdominal segment 2 and abdominal segment 3, of a 12-24h old first instar larva. The number of connections was estimated from the publication figures. The number of input synapses was the following (number in brackets left/right; ipsi- and contralateral connections separated by comma): from dda1 (15, 15/15, 15), ddaD (10, 4/15, 15), vbp (15, 8/15, 10), A02a (8, 18/20, 18). The number of output synapses was the following: to A03a1 (15/20), A02a (5/10), A1-7 dorsal motor neuron (12/12) (Schneider-Mizell et al., 2016.