Tumours of Nervous Tissue
Precursors of neural cells can give rise to medulloblastomas.
Once mature neurons are formed they lose the power of mitosis and do not give
origin to tumours. Certain tumours called germinomas appear near the midline
mostly near the third ventricle. They arise from germ cells that also give rise
Most tumours of the brain arise from neuroglial cells. Astrocytomas
are most common. Oligodendromas are also frequent.
Tumours can also arise from ependyma and from Schwann