0:00

Now, let's talk about the apparent origin

0:02

of the 7th and 8th nerve complex,

0:05

or cranial nerve eight,

0:06

which goes into the lowermost portion of the

0:10

brainstem pons at an oblique orientation.

0:14

Now, this is a little bit poorly understood

0:18

or not well recognized,

0:20

that it's the lowermost aspect of the pons,

0:23

that the 7th and 8th nerve complex comes off

0:25

almost to the level of the medulla.

0:27

If we cross-reference the cochlear nerve right there,

0:30

look where it is.

0:31

Right close to the pontomedullary sulcus.

0:35

Now, if we talk about the 8th cranial nerve

0:38

running between

0:39

the base of the pons and the medulla oblongata,

0:42

or the lower portion, it is this cistern right here,

0:46

which is known as the cerebellopontine angle cistern,

0:50

which is quite important.

0:52

Another name given to this is

0:53

the cerebellopontine angle.

0:55

So, here is your cerebellopontine angle right there.

0:59

The vestibulocochlear nerve is accompanied,

1:01

by the way,

1:02

by a very tortuous structure.

1:03

You can see a little bit of it right there,

1:05

this connecting anteroposterior oriented area of

1:09

flavoid known as the labyrinthine artery,

1:11

which arises from branches of the anterior

1:14

inferior cerebellar artery, or ICA,

1:16

at the cerebellopontine angle,

1:18

and goes with the 8th nerve

1:20

into the internal acoustic or auditory meatus.

1:23

Dr. P out.

Cranial Nerves 7 & 8: Cisternal Course at the CPA

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