Figure 6.

Cp–Imp and SLp–Imp neurons establish inhibitory type II synapses on their target neurons. A1–A3, Micrographs of serial ultrathin sections for electron microscopy showing two labeled axon terminals (arrows) in the CEc. A4, Larger magnification of one of these boutons making a symmetric synapse (arrowhead) with a dendritic shaft. B, Symmetric synapse between a labeled axonal terminal of a Cp–Imp neuron and a dendrite of a CEm neuron. C, Serial sections of a biocytin-labeled axon terminal of an SLp–Imp neuron in the AL. d, Dendrite; lt, labeled terminal; ut, unlabeled terminal. Scale bars: A1–A3, 1 μm; A4–C, 500 nm.