adult fan-shaped body delta neuron Original reference (Hanesch et al., 1989) did not limit the definition to FB neurons, but only FB neurons were described and now 'pontine neuron' is used to refer only to FB neurons (Bayraktar et al., 2010; Andrade et al., 2019). A couple of types have a small amount of arborization outside of the FB, meaning that these are not all strictly intrinsic (Scheffer et al., 2020; Hulse et al., 2021). fly_anatomy.ontology pontine fiber VFB:FBbt_00003636 pontine fiber system PFS Adult small-field columnar neuron that connects any two regions of the fan-shaped body and has its arbors mostly restricted to the fan-shaped body (Hanesch et al., 1989; Hulse et al., 2021). FBbt:00003636 pontine neuron small field neuron of the central complex fan-shaped body columnar neuron intrinsic neuron of the central complex