Fig. 8.

GABAergic cells are major postsynaptic targets of the small terminals of granule cells in the hilus. Shown are hilar axon arbors of two adjacent granule cells (gray and black) and their mGluR1a-immunoreactive targets reconstructed from three neighboring 60-μm-thick sections. Fifty-two of the 175 small terminals and filopodiae (arrowheads) innervated mGluR1a-immunoreactive targets, whereas large mossy terminals contacted none. A representative sample of 22 contacts was identified at the EM level (illustrated in Fig. 10). Boxed area in theinset shows the position of the axon arbor. Scale bar, 50 μm.