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.
WHAT IS METH MADE FROM? Methamphetamine is a synthetic (man-made) chemical, unlike cocaine, for instance, which comes from a plant. Meth is commonly manufactured in illegal, hidden laboratories, mixing various forms of amphetamine (another stimulant drug) or derivatives with other chemicals to boost its potency.