has characteristic has soma location has synaptic IO in region receives synaptic input from neuron sends synaptic output to cell larval ventral nerve cord larval RP2 motor neuron abdominal dorsal multidendritic neuron ddaD abdominal ventral bipolar dendrite neuron vbd NB2-1 Notch OFF hemilineage primary neuron proprioceptive system neuron period-positive median segmental interneuron cell body rind of larval ventral nerve cord larval abdominal dorsal multidendritic neuron dda1 larval A02a neuron larval A02b neuron 2016-08-04T17:05:49Z FBbt:00111664 VFB:FBbt_00111664 fly_anatomy.ontology looper-2 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). 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). larval excitatory interneuron eIN-4 bilateral