Where does “medullospinal” come from?

medullospinal (English) comes from English spinal, from Latin spīnālis, from Latin spīna, from Proto-Italic speinā, from Proto-Indo-European spēy- — to stretch; thrive; succeed.

Ancestry of “medullospinal”, step by step

medullospinal traces back through two separate lines of ancestry.

via English spinal

StepLanguageWordMeaning
1EnglishspinalOf or relating to the spine; Having a pithed...
2Latinspīnālisof or belonging to the spine; spinal
3Latinspīnaa thorn or a thorny tree or shrub, such as whitethorn, hawthorn, or blackthorn
4Proto-Italicspeināthorn
5Proto-Indo-Europeanspēy-to stretch; thrive; succeed

via English medullo

StepLanguageWordMeaning
1Englishmedullo
Every word from Proto-Indo-European spēy-