overlaps expresses FMRFa larval thoracic perisympathetic organ endocrine neuron larval neurosecretory neuron apterous-expressing neuron of the lateral cluster of the thorax apterous-expressing neuron of the lateral cluster of the thorax Ap4 2014-04-23T17:14:06Z dFMRFa neuron Apterous-expressing neuron of the lateral cluster that expresses the neuropeptide FMRFamide and is the last neuron of the cluster to be generated, after the Ap3 neuron (Benveniste et al., 1998; Baumgardt et al., 2007; Baumgardt et al., 2009). It projects its axon medially, below the ventrolateral, central lateral and central intermediate tracts and approaches the dorsal median tract from below, where it arborizes extensively (Santos et al., 2007). Unlike other Ap neurons, it innervates a thoracic dorsal neurohemal organ (Baumgardt et al., 2007). FBbt:00110872 thoracic ventral neurosecretory cell Tv4 neuron Ap4 neuron VFB:FBbt_00110872 fly_anatomy.ontology Tv neuron This neuron has been identified as neurosecretory because it expresses the neuropeptide FMRFamide (FBgn0000715) and innervates a neurohemal organ (Benveniste et al., 1998; Marques et al., 2003; Santos et al., 2007). Ap4/FMRFa neuron FMRF +ve Tv neuron