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. 2018 Dec 11;7:e40247. doi: 10.7554/eLife.40247

Figure 4. Sensory-sensory communication.

(A) Percentage of sensory neurons of sensory compartments involved in intra compartment sensory connections. Around 80% of all sensory neurons in ACa, AVa, AVp, ACp and VM form intra sensory connections. ACal and ACpl have the lowest number of neurons and also show low number of intra sensory contacts. (B) Connectivity diagram of axo-axonic connections between sensory neurons. The circular wheel arrangements represent previously defined sensory compartments (see Figure 2). Each small circle within a wheel represents a single neuron. Gray links show inter-cluster connections (max. 10 synapses in one direction). Note that sensory to sensory contacts are made mainly between sensory neurons of the same class, not between classes. (C) Percentage of synapses of sensory neurons from and onto sensory neurons. (D) Summarizing representation of axo-axonic contact input-to-output ratio viewed from the presynaptic neuron side (top) or from the postsynaptic neuron side (bottom). See Figure 4—figure supplements 1–2 for detailed connectivity.

Figure 4.

Figure 4—figure supplement 1. Connectivity principles of inter-sensory connections.

Figure 4—figure supplement 1.

(A) Amount of monosynaptic downstream partners (sensory neurons) per sensory neuron, using a synaptic threshold of 1–3 synapses. (B) Percentage of neurons per sensory compartment showing hierarchical or reciprocal inter sensory connections. Most of the sensory neurons are connected in a hierarchical manner. (C) Percentage of all unidirectional connections across all sensory clusters in relation to synaptic strength between two sensory neurons (left panel). Amount of reciprocal connection combinations between two sensory neurons (right panel). (D) Connectivity graph of all inter-sensory contacts of ACp and VM neurons using a synaptic threshold of 2. Sensory information with different peripheral origin (nerves, organs) is integrated at the sensory level. Node numbers indicate amount of sensory neurons.
Figure 4—figure supplement 2. Map of inter-sensory connections.

Figure 4—figure supplement 2.

Force-directed connectivity graph of all axo-axonic connections between sensory neurons. Each node represents a single neuron. Nodes are colored based on their broader identity (sensory compartments).