obsolete Tv neuron true fly_anatomy.ontology dFMRFa neuron Larval neurosecretory neuron whose cell body is located close to the lateral border of the thoracic neuromere, ventrolaterally to the ventrolateral tract of the midline. It projects its axon below the ventrolateral tract, central lateral and central intermediate tracts and approaches the dorsal median tract from below, where it arborizes extensively. It fasciculates with the contralateral Tv neuron and innervates the thoracic neurohemal organ. The Tv neuron is one of the neurons of the cluster of apterous-expressing neurons of the lateral cluster of the thorax. The arborization at the dorsal median tract of the 3 pairs of Tv neurons overlaps and extends until the region between the first and second abdominal neuromeres (Benveniste et al., 1998; Marques et al., 2003; Santos et al., 2007). Ap4 neuron Obsoleted due to equivalence with the Ap4 neuron - https://orcid.org/0000-0002-1373-1705. FMRF +ve Tv neuron FBbt:00006019 apterous-expressing neuron of the lateral cluster of the thorax Ap4