Fig. 5.

Synaptic interaction between IGL efferents and hypothalamic cells. Electron micrograph taken of the arcuate nucleus (A), periventricular area (B), MPO (C), and anteroventral periventricular nucleus (D) from the material triple immunolabeled for PHA-L, TH (arrowheads on A, D point to immunogold), and FG (arrows). PHA-L-immunoreactive boutons originating in the IGL establish symmetric axosomatic (A–C) and axodendritic (D) synaptic contacts (large arrows) with hypothalamic cells that contain TH and/or FG immunolabeling. Scale bars, 1 μm.