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====Pathogenesis====
====Pathogenesis====
[[Image:hernial sac.jpg|thumb|right|150px|Diagram of a hernial sac (Courtesy of Elspeth Milne)]]
* Associated with trauma or the weakening of tissues.
* Associated with trauma or the weakening of tissues.
** For example,
** For example,
*** Straining
*** Straining
*** Wound dehiscence.
*** Wound dehiscence.
* Most hernias are external[[Image:hernial sac.jpg|thumb|right|150px|Diagram of a hernial sac (Courtesy of Elspeth Milne)]]
* Most [[Hernia, External|hernias are external]]
** Contents pass through a hernial ring in the abdominal wall.
** Contents pass through a hernial ring in the abdominal wall.
** Are covered with parietal peritoneum, soft tissue and skin.
** Are covered with parietal peritoneum, soft tissue and skin.