The mucous membrane lining the inner wall of the uterus, which thickens during the menstrual cycle and sheds during menstruation.
From Greek 'endo-' (inner) and 'metra' (womb). The term was coined in the 17th-18th centuries as anatomists developed microscopic observation and needed precise terminology for reproductive structures.
The endometrium is one of the most dynamic tissues in your body—it builds up, breaks down, and rebuilds every month, and without this cycle, human reproduction as we know it wouldn't exist.
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