Illustration from Scientific Research

All T4 dendrites receive inputs from both Mi9 and Mi1 neurons. In each column, different subsets of T4 dendrites receive input from a single Mi9 (B) or a single Mi1 (C) neuron. We describe one column as an example (column 1). Each circle demarcated with dotted lines indicates a different column; each column contains a single Mi9 and a single Mi1 axon terminal. Cyan indicates synapses established selectively by Mi9 in the distal domains of T4 dendrites (B), and yellow indicates synapses formed by Mi1 in the same column selectively with the central domains of a different subset of T4 dendrites (C). Synapses formed by Mi9 and Mi1 in the surrounding adjacent medulla columns are not shown. The right panels show the individual T4 neurons with distal domains overlapping (B) and overlapping middle domains (C). Colored arrows matching the dendrite colors indicate the proximal (PROX.) to distal (DIST.) polarity of these dendrites. The large black dots indicate the base of the dendrite in the proximal domain.

DOI