Meningiomas are named according to their location (Fig 1) and cause various symptoms: 1  Convexity meningiomas: grow on the surface of the brain. They may not produce symptoms until they reach a large size. 2  Falx and parasagittal meningiomas: grow from the dura fold that runs between the left and right sides of the brain.
Tectum | Tegmentum | See also. The midbrain, or mesencephalon is made up of two main structures and surrounds the cerebral aqueduct.he midbrain, or mesencephalon is made up of two main structures and surrounds the cerebral aqueduct.
A nerve is usually made up from a variety of fascicles. Each fascicle is encased by perineurium. Inside the fascicle are a group of axons bathed in endoneurial fluid. Each axon has an insulating lining of myelin  a fatty material inside the Schwann cells. Between the fascicles is a fatty material called the interfascicular epineurium. The nerve is then wrapped in the main epineurium. Even if the sensitive living axons are damaged, the conduit made up of epineurium and perineurium will often survive and provide a pathway for regrowing nerves.