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6_Unit2.1_NS_Intro copy

For perspective 15 x the population of the world rank

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Unformatted text preview: billion neurons in humans # of neurons are in the human brain ~100,000,000,000 100 trillion synapses tho…. for perspective … 15 x the population of the world ! ! ! ! ! ! Rank ! ! ! ! Country ! ! ! ! ! ! Population 1 6,446,131,400 2 China 1,306,313,812 3 How many synapses are there in the human nervous system? World India 4 European Union 5 United States 1,080,264,388 ! ! 456,953,258 295,734,134 as of July 2005 ~100,000,000,000,000 Some sources give the average number of synapses on a neuron as 1,000 to 10,000. 7 7/4/12 we lose 50,000 neurons a day after 20……. Until recently it was thought that you are born with the all the neurons you ll ever have. It is now known that there is some limited new cell formation. However, some estimates say we lose 50,000 neurons per/day between the ages or 20 to 75. acending-- to the CNS0 affernt all mean the same thing Flow ofof Information low Information these are synanyms !!!! PNS to CNS Incoming Sensory Afferent Ascending CNS to PNS Outgoing Motor Efferent Descending define reflex--- its a involuntary specific response to a specific stimulus Reflexes Patellar Reflex need to knw these things Crossed Extensor Reflex patella refle...
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