The distance of extracellular space between the sheath and the neuronal plasma membrane measures , allowing the neuron and its SGC sheath to form a single anatomical and functional unit. These individual units are separated by areas of connective tissue.
The distance within the extracellular space between the sheath and neuronal plasma membrane is , facilitating the integration of the neuron and its SGC sheath into a unified anatomical and functional structure. These separate units are divided by regions of connective tissue.