Medical Dictionary

sinus rhomboidalis

noun sinus rhom·boi·da·lis \ -ˌräm-ˌbȯid-ˈā-ləs \

medical Definition of sinus rhomboidalis

:the posterior expanded and for a long time incompletely closed part of the neural groove of vertebrate embryos; also :an expansion of the central canal in the sacral region derived from it

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