A person can survive destruction of an entire cerebral hemis

A person can survive destruction of an entire cerebral hemisphere but cannot survive destruction of the hypothalamus, a much smaller mass of brain tissue. Why is this? How might destruction of half of the cerebrum affect an individual?

      _Why do most tumors arise from glial cells and not neurons?

Solution

Answer:-

1.The cerebral functions essential for survival are duplicated in the right and left hemispheres, so the loss of even an entire hemisphere is not fatal.

2.It will, however, result in such things as visual, motor, language, and cognitive deficits.

3.The hypothalamus, is involved in so many basic homeostatic functions that its loss or destruction is not survivable.

2.Brain contains other types of cells than neurons, namely glial cells, only neurons are the ones generally can not regenerate as they are lack of cell division,do not develop into tumors.

*But supporting cells called glial cells undergo cell division hence become tumors.

*A lot of brain cancers are the result of uncontrolled growth of glial cells, for example a glioma arises from astrocytes.