overlaps synaptic neuropil domain lower tectulum The neuropil referred to as ovoid in Namiki et al. (2018) supplementary file 1 has an identical innervation profile to lower tectulum in Figure 5, so I have added this as a synonym - https://orcid.org/0000-0002-1373-1705. LTct ovoid VFB:FBbt_00047174 fly_anatomy.ontology Ventralmost layer of the tectulum that extends posteriorly from the prothoracic medial ventral association center to the posterior margin of the mesothoracic neuromere at the commissure of fine fibers (Court et al., 2020). It is bordered ventrally by the ventral median tract of ventral cervical fasciculus and laterally by the dorsal lateral tract of ventral cervical fasciculus (Court et al., 2020). FBbt:00047174 tectulum subdivision adult mesothoracic neuromere