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. 2014 May 13;522(17):3795–3816. doi: 10.1002/cne.23622

Figure 12.

Figure 12

Schematic representation of UV vision in the M6 stratum. A: Retinotopic representation of UV-sensitive neurons in the M6 stratum. Each of approximately 800 R7 neurons relays UV information along one column to terminate at the M6 stratum, forming a UV retinotopic map (blue). The UV polarization-detecting DRA neurons (yellow) project to the dorsal-lateral M6 stratum. B: Top view of the left optic lobe shows chiasmatic information relay (×1) from frontal and rear ommatidia to posterior and anterior M6, respectively. Directional M6-LNs (red) relay information from the anterior to the posterior M6 (arrow). Med, medulla; Lob, lobula; Lop, lobula plate. C: Innervation territories of nondirectional M6-LN clusters (shown in different colors) form a mosaic of seven domains, covering the whole M6 retinotopic field. D: Functional motif in the M6 stratum: R7/R8 input neurons, narrow-field output projection neurons (black; i.e., Dm8 to the M4 stratum and Tm5 to the lobula), nondirectional LNs (green, red, and orange), and directional M6-LNs (blue).