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Now in the back of the brain stem, what is needed from the practical point of view is
the back of the midbrain and here we have four bodies separated by a cross which is
called the cruciform sulcus. The four bodies are the two superior colliculi and the two inferior colleculi.
Below the inferior colliculus there is a collection of nerve fibers which is called the superior
cerebellar peduncle which is not seen except from the back. Three spots only are needed
in the back of the midbrain
which are the superior colliculus, the inferior colliculus and the superior cerebellar peduncle. When
we go to the upper surface of the cerebellum, we'll have first the horizontal sulcus where
the middle peduncle passes through. When we go to the upper surface of the cerebellum
which is flat we'll have the primary fissure separating the anterior lobe of the cerebellum
from the posterior lobe. There are 5 practical spots in the cerebellum. Three structure in
the upper surface, the primary fissure, the anterior lobe and the posterior lobe close
to the posterior notch where the falx cerebelli passes. When we come down we have the horizontal
fissure which is related to the middle cerebellar peduncle and this is the 4th spot and when
we come to the lower surface we'll have this part which is in direct contact with the medulla.
Now if we have a sagittal section in the brain stem dividing it into two then what we'll
see ? The cerebellum, pones
and the medulla are
called all together the hindbrain and the cavity between them is called the 4th ventricle. So the last spot needed
is the 4th ventricle that separates anteriorly the pones and the medulla and posteriorly
the cerebellum. This finishes all spots about the brain stem and cerebellum and what remains
is what about the cerebrum