Coronals:
You are looking caudally here and on the left
side the caudal end of the lateral ventricle
can be seen.
The cerebral
aqueduct is very prominant and you can see the periaqueductal
gray (the around the aqueduct
gray).
On the dorsal
surface of the midbrain
you can see the two hills (colliculi) - the superior
colliculi. They sit superior to (on top of) the inferior
colliculi
(go figure) that we'll see in the next figure. You should be able
to see that the superior colliculi
are layered (laminated). When
you are trying to differentiate between superior and inferior
colliculi, this lamination is a good clue since the inferior colliculus
doesn't have a layered look. The superior colliculus also has a
squared appearance, sort of like a commercial loaf of bread. The
inferior colliculus has a more
rounded, mouse ear, appearance.
The cerebral
peduncles are well developed here. Above each you
may be able to see a gray region that is the substantia nigra. In
sheep, the substantia nigra
is not as nigra (dark) as it is in some
other species, like humans.