Falx Cerebelli.
The equator separates the north and south hemispheres.
Iran is found in the Northern and the Eastern Hemispheres.
north and south
north east
Cerebellar ataxia manifests itself starting with the dominant genes in the brain. As the genes start to manifest it causes a gradual shutdown of the organs of the body.
The falx cerebelli invaginates into the cerebellar notch between the two cerebellar hemispheres. It doesn't actually separate the two hemispheres though. The falx cerebri separates the two cerebral hemispheres.
The cerebral hemispheres are connected by the corpus callosum.
It is the cerebellar vermis.
The structure you are referring to is the falx cerebelli. It is a tent-like fold of the dura mater that lies between the cerebellar hemispheres and helps to stabilize and protect the brain.
The transverse fissure.
vermis
There is one line, the equator, that separates the northern from the southern hemisphere.
The cortex is divided into two sections referred to as the cerebral cortex and the cerebellar cortex.
The groove that divides the cerebrum in two hemispheres is called the longitudinal fissure. It separates the left and right hemispheres of the brain and is where the corpus callosum connects the two hemispheres.
The Equator (zero latitude) that separates the Northern and the Southern Hemispheres, and the Prime Meridian (zero longitude) that separates the Western and the Eastern Hemispheres.
ipsilaterally
The falx cerebri separates the right and left hemispheres.