Figure 7.

Most estimated intrinsic and extrinsic axonal conduction delays are within an order of magnitude of neuronal integration delays apart from when axons conduct at their slowest rate and neurons operate in a high-conductance state. (A) Intrinsic axon path lengths of spiny neuron within gray matter in adult cat cerebral cortex (n = 22,001 paths from 19 neuron reconstructions). Data taken from Budd et al. (2010). (B) Extrinsic axonal fiber tract lengths in adult macaque cerebral cortex (n = 2309 pathways). Data taken from Kaiser and Hilgetag (2006).