Fig. 6.

Three synaptic terminals in en face representations of their appositions with TTMNs. A: Lg Rnd; B: Sm Rnd; C: Pleo. The apposition is drawn for individual sections (in gray lines plus one dark line for the section used for apposition measurement) and each is staggered from the next by the section thickness (80 nm). Darkly outlined areas indicate locations of synapses (shown for single sections by arrowheads) and dashed areas indicate adherens junctions (ad). A smooth contour is used between adjacent sections. The number of sections available for the Lg Rnd terminal is 21, for the Sm Rnd terminal is 13, and for the Pleo terminal is 13. Dashed lines for the right-most sections of the Lg Rnd and Sm Rnd terminals indicate that the apposition appeared to extend beyond our series of sections. Scale bar: 0.5 um.