Mysterious synapses

There are so many things that are still unknown in Tritonia brain.
Especially, the synaptic connectivities of neurons are so mysterious and puzzling.

One typical example is the synapse from VSI-B to VSI-follower cell (VSIF).
VSI-B excites VSIF from both sides, ipsilaterally and contralaterally though PdN6, but it is totally unknown where they connect. Is it direct synapse, or indirect, or mediated another electrically-coupled cell?


(from 4/29 lab meeting)


Today, I found another mystery in the synaptic output of DSI.
DSI was thought to project its axon to the contralateral PdG.
What I found was...