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.
tentorium cerebelli
It is the cerebellar vermis.
The transverse fissure.
vermis
There is one line, the equator, that separates the northern from the southern hemisphere.
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 Equator or Prime Meridian
Inter hemispheric fissure.
corpus callosum