Whats the brain madde of?!
Question: mush.
Answers: mush.
fat
is it.....
cheers check wekipedia
mashed peas....
...but if you want a serious answer then check this out!
http://mcdb.colorado.edu/courses/3650/co...
not sure what madde is. i'll assume you mean made of. tissues, nerves and whatnot. google the info.
Brain Facts and Figures:
Intracranial contents by volume (1,700 ml, 100%): brain = 1,400 ml (80%); blood = 150 ml (10%); cerebrospinal fluid = 150 ml (10%) (from Rengachary, S.S. and Ellenbogen, R.G., editors, Principles of Neurosurgery, Edinburgh: Elsevier Mosby, 2005
Water- 77- 78 %
Lipids- 10-12 %
Protein- 8%
Carbohydrates- 1 %
Soluble organic substances 2%
Inorganic Salts- 1%
Reference: McIlwain, H. and Bachelard, H.S., Biochemistry and the Central Nervous System, Edinburgh: Churchill Livingstone, 1985
Percentage of total cerebral cortex volume (human): frontal lobe = 41%; temporal lobe = 22%; parietal lobe = 19%; occipital lobe = 18%. (Caviness Jr., et al. Cerebral Cortex, 8:372-384, 1998.)
Number of cranial nerves = 12
Average number of neurons in the brain = 100 billion
Ratio of the volume of grey matter to white matter in the cerebral hemipheres (20 yrs. old) = 1.3 (Miller, A.K., Alston, R.L. and Corsellis, J.A., Variation with age in the volumes of grey and white matter in the cerebral hemispheres of man: measurements with an image analyser, Neuropathol Appl Neurobiol., 6:119-132, 1980)
Ratio of the volume of grey matter to white matter in the cerebral hemipheres (50 yrs. old) = 1.1 (Miller et al., 1980)
Average number of glial cells in brain = 10-50 times the number of neurons.
Length of myelinated nerve fibers in brain = 150,000-180,000 km (Pakkenberg et al., 1997; 2003)
Number of synapses in cortex = 0.15 quadrillion (Pakkenberg et al., 1997; 2003)
Difference number of neurons in the right and left hemispheres = 186 million MORE neurons on left side than right side (Pakkenberg et al., 1997; 2003