<P> The number of neurons and their relative abundance in different parts of the brain is a determinant of neural function and, consequently, of behavior . </P> <P> All numbers for neurons but Caenorhabditis and all numbers for synapses are estimations . </P> <Table> <Tr> <Th> Name </Th> <Th> Neurons in the brain / whole nervous system </Th> <Th> Synapses </Th> <Th> Details </Th> <Th> Image </Th> <Th> Source </Th> </Tr> <Tr> <Td> Sponge </Td> <Td> 5000000000000000000 ♠ 0 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Trichoplax </Td> <Td> 5000000000000000000 ♠ 0 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Asplanchna brightwellii (rotifer) </Td> <Td> 7002200000000000000 ♠ about 200 </Td> <Td> </Td> <Td> Brain only </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Caenorhabditis elegans (roundworm) </Td> <Td> 7002302000000000000 ♠ 302 </Td> <Td> 7003750000000000000 ♠ ~ 7,500 </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Jellyfish </Td> <Td> 7003560000000000000 ♠ 5,600 </Td> <Td> </Td> <Td> Hydra vulgaris (H. attenuate) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Megaphragma mymaripenne </Td> <Td> 7,400 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Box jellyfish </Td> <Td> 7003870000000000000 ♠ 8,700--7004175000000000000 ♠ 17,500 </Td> <Td> </Td> <Td> adult Tripedalia cystophora (8 mm diameter)--does not include 1000 neurons in each of the four rhopalia </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Medicinal leech </Td> <Td> 7004100000000000000 ♠ 10,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Pond snail </Td> <Td> 7004110000000000000 ♠ 11,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Sea slug </Td> <Td> 7004180000000000000 ♠ 18,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Amphioxus </Td> <Td> 7004200000000000000 ♠ 20,000 </Td> <Td> </Td> <Td> central nervous system only </Td> <Td> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> Fruit fly </Td> <Td> 7005250000000000000 ♠ 250,000 </Td> <Td> 7007100000000000000 ♠ <1 × 10 ^ </Td> <Td> </Td> <Td> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> Larval zebrafish </Td> <Td> 7005100000000000000 ♠ 100,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Lobster </Td> <Td> 7005100000000000000 ♠ 100,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Ant </Td> <Td> 7005250000000000000 ♠ 250,000 </Td> <Td> </Td> <Td> Varies per species </Td> <Td> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> Honey bee </Td> <Td> 7005960000000000000 ♠ 960,000 </Td> <Td> 7009100000000000000 ♠ ~ 1 × 10 ^ </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Cockroach </Td> <Td> 7006100000000000000 ♠ 1,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Adult zebrafish </Td> <Td> 7007100000000000000 ♠ ~ 10,000,000 </Td> <Td> </Td> <Td> cells (neurons + other) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Frog </Td> <Td> 7007160000000000000 ♠ 16,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Smoky shrew </Td> <Td> 7007360000000000000 ♠ 36,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Short - tailed shrew </Td> <Td> 7007520000000000000 ♠ 52,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> House mouse </Td> <Td> 7007710000000000000 ♠ 71,000,000 </Td> <Td> 7012100000000000000 ♠ ~ 1 × 10 ^ </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Nile crocodile </Td> <Td> 7007805000000000000 ♠ 80,500,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Golden hamster </Td> <Td> 7007900000000000000 ♠ 90,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Star - nosed mole </Td> <Td> 7008131000000000000 ♠ 131,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Zebra finch </Td> <Td> 7008131000000000000 ♠ 131,000,000 </Td> <Td> </Td> <Td> Brain only </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Brown rat </Td> <Td> 7008200000000000000 ♠ 200,000,000 </Td> <Td> 7011448000000000000 ♠ ~ 4.48 × 10 ^ </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Eastern mole </Td> <Td> 7008204000000000000 ♠ 204,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Guinea pig </Td> <Td> 7008240000000000000 ♠ 240,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Common treeshrew </Td> <Td> 7008261000000000000 ♠ 261,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Pigeon </Td> <Td> 7008310000000000000 ♠ 310,000,000 </Td> <Td> </Td> <Td> Brain only </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Octopus </Td> <Td> 7008500000000000000 ♠ 500,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Common marmoset </Td> <Td> 7008636000000000000 ♠ 636,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Cat </Td> <Td> 7008760000000000000 ♠ 760,000,000 </Td> <Td> 7013100000000000000 ♠ ~ 1 × 10 ^ </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Black - rumped agouti </Td> <Td> 7008857000000000000 ♠ 857,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Northern greater galago </Td> <Td> 7008936000000000000 ♠ 936,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Three - striped night monkey </Td> <Td> 7009146800000000000 ♠ 1,468,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Capybara </Td> <Td> 7009160000000000000 ♠ 1,600,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Raven </Td> <Td> 7009217100000000000 ♠ 2,171,000,000 </Td> <Td> </Td> <Td> Brain only </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Blue - and - yellow macaw </Td> <Td> 7009313600000000000 ♠ 3,136,000,000 </Td> <Td> </Td> <Td> Brain only </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Common squirrel monkey </Td> <Td> 7009324600000000000 ♠ 3,246,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Tufted capuchin </Td> <Td> 7009369100000000000 ♠ 3,691,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Rhesus macaque </Td> <Td> 7009637600000000000 ♠ 6,376,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Orangutan </Td> <Td> 7010326000000000000 ♠ 32,600,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Gorilla </Td> <Td> 7010334000000000000 ♠ 33,400,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Human </Td> <Td> 7010860000000000000 ♠ 86,000,000,000 </Td> <Td> 7014150000000000000 ♠ ~ 1.5 × 10 ^ </Td> <Td> Synapses for average adult </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> African elephant </Td> <Td> 7011257000000000000 ♠ 257,000,000,000 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Name </Th> <Th> Neurons in the brain / whole nervous system </Th> <Th> Synapses </Th> <Th> Details </Th> <Th> Image </Th> <Th> Source </Th> </Tr>

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