Etiology (alternately "aetiology") is the study of causation. In medicine it specifically refers to the causation of diseases or pathologies. The term is also used in philosophy, physics and biology in reference to the causes of various phenomena.
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... and opens in the vulva between the clitoris and the vaginal opening.
In the human male, the urethra is about 8 inches (200 mm) long and opens at the end of the penis. ...