Spinal α-MN  Oculomotor neuron
Target muscle fiber  Single fiber type1  Multiple fiber types1
Soma size  Larger2,3  Smaller2,3
Dendrite branching  Larger2  Smaller2
Motor unit size (innervation ratio)  Larger4,5,6,7  Smaller4,5,6,7
Resting potential  Smaller8,9,10  Higher8,9,10
Discharge frequency  100 Hz8,9,10  100–600 Hz8,9,10
Affected in ALS  Yes11,12,13,14  No11,12,13,14
Affected in aging  Yes15,16  No15,16