The axolemma is responsible for maintaining the membrane potential of the axon, and contains ion channels through which ions can flow rapidly.[1] When this occurs, the voltage inside the axon changes, and depolarization or hyperpolarization of the membrane can occur. Adequate depolarization can lead to an action potential, which travels down the axon in a self-propagating manner as more ion channels open due to stimulation by the influx of positive ions.[2] An unmyelinated axolemma has a high capacitance which imposes a restraint on the conduction speed. [citation needed]. The constricted axon segment is one of the few locations in which there is ten times more schwann cell membrane than axolemma, while other portions they have equal distributions.[3]