the logic of coma

extract  although there are new ways to portray the brain, colored and computerized encephalography but coma is still unknown and such as death remain beyond comprehension and knowing. is not it ?   perhaps because of this, despite knowing that some part of the brain is not yet fully understood all its parts. but knowing the components that working to each other is key for discovering a lot of secrets about coma.     loss of consciousness:   phenomenon of consciousness includes two parts: arousal and awareness that are related to the structure of the brain. arousal is state which control by reticular activating system (ras). ras start from medulla and continue to the thalamus and the brain stem. ras is a transitional, sensory, non- characteristic set that activate cerebral cortex.