A theoretical anatomical structure or layer, possibly referring to inner tissues or membranes in medical terminology.
From endo- (within) + -angium (vessel, from Greek angeion + Latin -ium, a neuter noun ending). This term combines Greek and Latin roots in a way typical of anatomical nomenclature.
Medical Latin loves the -ium ending for structures (like myocardium or pericardium), so 'endangium' follows perfect Latin rules but was likely never widely adopted because doctors couldn't agree on what specific structure it described.
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