tip: click on left (pre-synaptic) or right (post-synaptic) boxes to focus on a circuit layer or morphological type (m-type). Click on a connection to focus on a pathway (m-type to m-type). For more info, click on "?" above.

L1 158 pathways L1 L23 411 pathways L23 L4 478 pathways L4 L5 498 pathways L5 L6 387 pathways L6 L1 142 pathways L1 L23 358 pathways L23 L4 457 pathways L4 L5 515 pathways L5 L6 460 pathways L6

Microcircuit fact sheet

Microcircuit volume?
0.29 mm³
No. of neurons?
31,346 neurons
No. of layers?
6
No. of morphological types?
55
No. of neurons per layer?
L1
 338 neurons
L23
 7,524 neurons
L4
 4,656 neurons
L5
 6,114 neurons
L6
 12,651 neurons
No. of morphoelectrical types?
207
No. of electrical types?
11
No. of unique types of synaptic connections between m-types?
1,941 connection types
No. of unique types of synaptic connections between me-types?
27,625 connection types
No. of s-types?
6 types
No. of intrinsic connections?
~8.1 million connections
No. of intrinsic synapses?
~37 million synapses
No. of extrinsic connections?
~40 million connections
No. of extrinsic synapses?
~147 million synapses
Layer thicknesses?
L1
 165 µm
L2
 149 µm
L3
 353 µm
L4
 190 µm
L5
 525 µm
L6
 700 µm
Neuron densities?
L1
 14,200 neurons/mm³
L2
 164,600 neurons/mm³
L3
 83,800 neurons/mm³
L4
 177,300 neurons/mm³
L5
 83,900 neurons/mm³
L6
 131,500 neurons/mm³