descending neuron of the gnathal ganglion DNg30 obsolete adult gnathal ganglion serotonergic projection neuron 2023-06-29T14:29:28Z true A serotonergic projection neuron of the gnathal ganglion (Scheunemann et al., 2018). There is one such neuron per hemisphere, with a soma located at the lateral border of the gnathal ganglion. It projects contralaterally into the gnathal ganglion and the saddle, crossing the midline close to the digestive tube. It also projects ipsilaterally to the superior clamp surrounding the mushroom body peduncle, where it connects to the MP1 dopaminergic neuron to trigger oscillatory activity, and to ventrolateral protocerebrum and the superior lateral protocerebrum. Its pre-synaptic terminals localize to the processes in the superior clamp, the ventrolateral protocerebrum, and throughout the gnathal ganglion and the saddle. It is involved in the initial period of long-term memory consolidation. It expresses the sex peptide receptor (Scheunemann et al., 2019). SPN neuron Obsoleted due to equivalence with DNg30 (Sturner et al., 2025 - FlyBase:FBrf0262850). FBbt:00059265 fly_anatomy.ontology