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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
poles
The ends of a magnet are called the poles.
The Synapse, also called the synaptic cleft.
'Sticks' used to ski are called skiing poles.
poles
Poles
poles
Several planets are flattened at the poles. That just means the distance between the poles is less than diameter of the planet at the equator. Saturn is the most extreme example in our solar system, followed by Jupiter. Even the Earth is slightly flattened at the poles. Astronomers call this "oblateness".
prime meridian