Photo © Dr Ahmad Haneih MBBCH,FRCS,FRACS
|Dimensions and Sizes
Average dimensions of the adult brain:
Width = 140 mm/5.5 in, Length = 167mm/6.5 in, Height = 93 mm/3.6 in.
The breakdown of intracranial contents by volume (1,700 ml, 100%): brain = 1,400 ml (80%); blood = 150 ml (10%); cerebrospinal fluid = 150 ml (10%).
The cerebellum contains half of all the neurons in the brain but comprises only 10% of the brain.
The cerebral cortex is about 85% of the brain.
Percentage of total cerebral cortex volume = frontal lobe 41%, temporal lobe 22%, parietal lobe 19%, occipital lobe 18%.
There are about 100 billion neurons in the human brain, the same number of stars in our galaxy.
The left hemisphere of the brain has 186 million more neurons than the right hemisphere.
750-1000ml of blood flow through the brain every minute or about 3 full soda cans.
In that minute the brain will consume 46cm3 (1/5 cups) of oxygen from that blood.
Of that oxygen consumed, 6% will be used by the brain's white matter and 94% by the grey matter.
The brain can stay alive for 4 to 6 minutes without oxygen. After that cells begin die.The slowest speed at which information travels between neurons is 416 km/h or 260 mph, thats as "slow" as todays supercar's top speed (the Bugatti EB 16.4 Veyron clocked at 253 mph).10 seconds is the amount of time until unconsciousness after the loss of blood supply to the brain.Time until reflex loss after loss of blood supply to the brain, 40-110 seconds.During early pregnancy the rate of neuron growth is 250,000 neurons a minute.
Other Fun Facts About The Human Brain
How much does human brain think?
Source Brain Health