Brain and Cranial Nerves
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Number of brain cells and mass of this organ
- one trillion cells
- 3 pound/ 1300g
- * one of largest organs
Four principle parts... location?
- brain stem
allows for communication between hemispheres of the cerebrum
meniges: ( location) and function
- Dura mater: superior, ( outer most) endosteal layer outer thicker, meningeal layer- inner/ thinner layer
- Arachnoid: (middle) medial
- Pia mater: inner most deep
Fluid that surrounds brain? function/location
cerebral spinal fluid ( CSF): exchange of nutrients, waste products, protection, in ventricles
barrier formed by ependymal cells/ functions
BBB, ( blood brain barrier) protects brain from harmful substances, and pathogens
where is CSF produced? absorbed?
- produced: choroid plexus
- reabsorbed: arachnoid villi
cavities of brain where csf is found and circulates
2 lateral, third and forth ventricles
Functions of CSF
nutrients, wastes, protection, in ventricles
Amount of oxygen used compared to mass
2% of body mass, uses 20% of oxygen
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