Whole Nervous System
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| Name | Neurons in the brain/whole nervous system | Details | Image | Source |
|---|---|---|---|---|
| Sponge | 0 | |||
| Trichoplax | 0 | |||
| Caenorhabditis elegans (roundworm) | 302 | ~ 5,000 synapses | ||
| Medicinal leech | 10,000 | |||
| Pond snail | 11,000 | |||
| Sea slug | 18,000 | |||
| Fruit fly | 100,000 | ~ 107 synapses | ||
| Lobster | 100,000 | |||
| Ant | 250,000 | Varies per species | ||
| Honey bee | 960,000 | ~ 109 synapses | ||
| Cockroach | 1,000,000 | |||
| Frog | 16,000,000 | |||
| Mouse | 75,000,000 | ~ 1011 synapses | ||
| Rat | 56,000,000 | 448 × 109 | ||
| Octopus | 300,000,000 | |||
| Cat | 1,000,000,000 | 1012–1013 synapses | ||
| Common Chimpanzee | 6,700,000,000 | |||
| Elephant | 23,000,000,000 | |||
| Human | 85,000,000,000 | For average adult; 1014–1015 synapses |
Read more about this topic: List Of Animals By Number Of Neurons
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