This is interesting. I was looking up Dura mater and this video popped up. Never seen it before. https://www.youtube.com/watch?v=vZ-73TXu7nM
This video that is also linked is even better imo:
https://www.youtube.com/watch?v=zczRsc86NYU
There are a few screen captures that might help you.
This one addresses both before and after the stab wounds:
https://www.youtube.com/watch?v=aXR0itwtm74