(Darwin 1897, 123) referred to the term “spinal marrow” when comparing the shape of the foramen magnum in wild rabbits versus large “lop-eared” rabbits. After looking up the term “marrow,” (which refers to the fat in the middle of bones from which blood is formed,) I found that the term is also used to refer to the spinal cord. Interesting.
Bibliography:
Darwin, Charles. The variation of animals and plants under domestication, Volume I. New York: D. Appleton and Company, 1897.
Resources:
darrellbarnes.blog 
I did not know that either … Interesting. I also looked that up in my 2009 21st edition of Taber’s Cyclopedic Medical Dictionary… “An obsolete term for the spinal cord” .
That term was used for many many years …. Thank you for sharing your interesting finds !!
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Cool deal!
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