What are adjectives the parts to the jumpy system?

And what's the difference between the cerebrum and cerebral cortex?What are adjectives the parts to the jumpy system?
fretful system formed of 2 parts:
-central nervous system:1-brain which is formed of
.cerebrum(wich is alike as the cerebral cortex)
.cerebelum
.brainstem(formed of mid brain,pons,medulla oblongata)
2-spinal cord which is formed of 8 cervial,12 thoracic,5 lumbar,5 sacral,1 coccegeal segment.
- peripheral disturbed system:formed of
1-10 pairs of cranial nerves arising from brain
2-32 pairs of spinal nerves arising from spinal cord.
brain spine and nerves are the parts, do the rest of your homework yourself.
http://en.wikipedia.org/wiki/definition...
Nerves-hee hee
Cerebellum needs a lube once within awhile and the cerebral is other hard never thinking of the consequences to stir up in cortex.