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.
Second, the loop of Henle, This has a thick descending portion (pars recta), a thin descending portion, a thin ascending portion, and a thick ascending portion. The lumen is made up of simple squamous epithelium.This part of the nephron is hard to tell apart from adjacent capillaries, except that there are no red blood cells in the lumen. Finally, the distal convoluted tubule. These tubules are less numerous than the proximal convoluted tubules.econd, the loop of Henle, This has a thick descending portion (pars recta), a thin descending portion, a thin ascending portion, and a thick ascending portion. The lumen is made up of simple squamous epithelium.