From: Dissecting a neuron network: FIB-SEM-based 3D-reconstruction of the visual neuropils in the sea spider Achelia langi (Dohrn, 1881) (Pycnogonida)
Presynaptic cells
→ presynaptic to ↓
R-cells (number = 18)
D-Cells (number = 7)
A-cells (number = 8)
0
1
43
R-cells
32
8
D-cells
5
A-cells
22
3
14
cells not reconstructed
3.3
0.9
8.1
synapses/cell (average)a