A: Fluorescent image showing FG tracer injection site (white arrow) in the septal region. The injection site centers near the intermediate part of the lateral septal nucleus (B, hatched area), which receives a prominent Ucn 3 fiber innervation. cc: Corpus callosum, LSd: Dorsal part of the lateral septal nucleus, LSi: Intermediate part of the lateral septal nucleus, LSv: Ventral part of the lateral septal nucleus, LV: Lateral ventricle, MS: Medial septal nucleus. Scale bar: 100 μm.