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The brain is extremely sensitive to hypoxia, and occlusion of its blood supply produces unconsciousness in as short a period as 10 seconds.
The brain¡¯s consumption of glucose and oxygen are constant regardless of resting/ sleeping or active/ waking
The glucose transporter, GLUT-1, is enriched
High energy requirements (~1.0 mg/kg/min)
Low energy reserves
The energy is needed to maintain the ionic gradient across nerve membranes.
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Water 75, 77~78
Lipids 5, 10~12
Protein 18~20 8
Carbohydrate 1, 1
Soluble organic 3~5, 2
Inorganic salts 1, 1
size = 140 * 167 * 93, 1400ml
blood = 150 ml (10%); cerebrospinal fluid = 150 ml (10%)
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Average number of neurons in the brain = 100 billion
% of cerebral oxygen consumption by white matter = 6%
% of cerebral oxygen consumption by gray matter = 94%
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
Number of synapses in cortex = 0.15 quadrillion (Pakkenberg et al., 1997; 2003)
Rate of neuron growth (early pregnancy) = 250,000 neurons/minute
Surface area of cerebellar cortex = 50,000 cm2
Number of Purkinje cells = 15-26 million
Number of synapses made on a Purkinje cell = up to 200,000
Weight of hypothalamus = 4 g
Volume of suprachiasmatic nucleus = 0.3 mm3
Number of fibers in pyramidal tract above decussation = 1,100,000
Number of fibers in corpus callosum = 250,000,000