That's the Equator.
It's a 'bridge' where the neurotransmitters jump from one neuron to the other. It is called synapse. This is a simple notion that I have about this subject. For a complete review involving this part of the brain and how it works see the link to "Neuron" below.
It's a neuron
The ends of a magnet are called the poles.
poles
The Synapse, also called the synaptic cleft.
'Sticks' used to ski are called skiing poles.
poles
poles
Resting potential.
The imaginary line passing through the center of the Earth between the North and South Poles, around which the Earth rotates, is called the Earth's axis.
Without poles, it's not a magnet. It's just a bar. All magnets have north and south poles.