myelospongium

noun
my·e·lo·spon·gi·um | \ˌmī-ə-lō-ˈspän-jē-əm, -ˈspən- \
plural myelospongia\-jē-ə \

Medical Definition of myelospongium 

dated

: a network in the embryonic central nervous system derived from the spongioblasts and giving rise to the glia

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