splenium

noun
sple·​ni·​um | \ ˈsplē-nē-əm How to pronounce splenium (audio) \
plural splenia\ -​nē-​ə How to pronounce splenia (audio) \

Medical Definition of splenium

: the thick rounded fold that forms the posterior border of the corpus callosum and is continuous by its undersurface with the fornix

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