 Okay, good day, ladies and gentlemen. Just to continue with a few other points what I've done I've taken an axial section through the midbrain Unfortunately during the separation from the cadaver the other half of the midbrain had been destroyed So we have only this half of the midbrain namely the left half So I've taken an axial section what we can see these are the following structures We can identify this what you see here in front of you. This is known as the cross cerebrae of the midbrain This contains the corticospinal the corticobulbar tracts and the frontal pontine and the pariet temporal pontine tracts Just behind that you can see a pigmented area here This is the substantia nigra Which is part of the basal ganglia which is part of the extra pyramidal system and this is the one which is degenerated in Parkinson's disease If you look the same thing will be present on the other side also But as I said, it is unfortunately it has been destroyed while removing from the cadaver section If you look posterior to this this whole area that we see here This is known as the tegmentum of the midbrain and the tegmentum of the midbrain If you look at the middle of the tegmentum this portion This is known as the decussation of the superior cerebellar peduncles Which I had mentioned in my dissection of the cerebellum where I mentioned that the fibers which are coming out from the dentate nucleus They cross over to the opposite side and therefore this decussation of the superior cerebellar peduncles is where the crisscrossing takes place To continue with our story if you look at this small opening here. This is the aqueduct of sylvius And just behind the aqueduct of sylvius you can see two small globular swellings They are respectively the superior and the inferior colloquial eye Around the aqueduct of sylvius we can see a little bit of gray matter here That is the periaqueductal gray matter and in just anterior lateral to them We have the CN3 oculomotor nuclei and we have the CN4 the Chocolier nuclei depending on whether the section has gone through the superior colliculus or whether the section has gone through the inferior colliculus So these are the structures which I wanted to show to you in a dissection of the midbrain and how it is related to the cerebellum Have a nice day