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. Author manuscript; available in PMC: 2012 May 2.
Published in final edited form as: J Comp Neurol. 2000 Jan 3;416(1):19–29. doi: 10.1002/(sici)1096-9861(20000103)416:1<19::aid-cne3>3.0.co;2-h

Fig. 7.

Fig. 7

a: A DB3 axon varicosity makes a ribbon synapse (arrow) onto a relatively electron-lucent amacrine cell (A) and a ganglion cell (G). The amacrine cell makes a feedback synapse (arrowhead) onto the DB3 axon. b: A DB3 axon makes a ribbon synapse (arrow) onto two amacrine cell processes (A). One of the amacrine cells makes a feedback synapse (arrowhead) onto the DB3 axon. c: A DB3 axon makes a ribbon synapse (arrow) onto two amacrine cell processes (A). One of the amacrine cells makes a feedforward synapse (arrowhead) onto the other amacrine cell in the dyad. d:A DB3 axon makes a ribbon synapse (arrow) onto an electron lucent amacrine cell (bottom) and an electron-dense amacrine cell (top). The electron-dense amacrine cell also makes a feedforward synapse (arrowhead) onto the larger, electron-lucent amacrine cell. Scale bar = 0.5 μm.