a. The abdominopelvic cavity is a closed system filled with a fluid (water) continuum.
b. The abdominopelvic cavity is inclosed by essentially muscular barriers.
(1) The inferior end is closed off by the pelvic diaphragm.
(2) The cylindrical walls of the abdomen are composed of three muscular sheets. Their orientation is similar to plywood. These muscles are kept taut by their intrinsic tone, but they are capable of additional contraction.
(3) Forming the top of the abdominopelvic cavity is the thoracic diaphragm. We discuss the thoracic diaphragm in the next paragraph.
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