part of directly develops from adult brain Pdf neuron close to calyx FBbt:00003765 VFB:FBbt_00003765 fly_anatomy.ontology Neuron of the adult brain that expresses Pdf and whose soma is located dorsoanterior to the calyx of the mushroom body. Its branches extend ventrally into the dorsal esophageal foramen. There are between 4-8 neurons in each hemisphere. PDFCa pigment-dispersing hormone-immunoreactive neuron close to calyx adult Pdf neuron pupal Pdf neuron close to calyx