"The frog instantly dies when the spinal cord is pierced; and before this it lived without head, without heart or any bones or intestines or skin, and here therefore it would seem lies the foundation of movement and life. All the nerves of the animals derive from here: when this is pricked they instantly die."
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Original Language: English
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Sources
Leonardo da Vinci, The Notebooks
https://en.wikiquote.org/wiki/Spinal_cord
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Spinal cord
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