subcommissural organ

noun
sub·​com·​mis·​sur·​al organ | \ ˌsəb-ˌkäm-ə-ˌshu̇r-əl- How to pronounce subcommissural organ (audio) \

Medical Definition of subcommissural organ

: an aggregation of columnar cells situated between the posterior commissure and the third ventricle of the brain

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one from the Upper Peninsula of Michigan

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