Coelomic Cavities
Coelomic Cavities

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coelom / coelomic cavities - pericardial cavity, pleural cavities, and peritoneal cavity - potential spaces enclosing moving and moveable viscera (heart, lungs, gut, liver, spleen, and pelvic organs) - coelomic cavities allow lubricated organ expansion and contraction - contain lubricating fluid - clear serous fluid, derived from plasma by transudation through mesothelial surfaces - mesothelium is also called serous membrane or ser osa - coelomic cavity surfaces and organ surfaces are covered by mesothelium - simple epithelium of cuboidal mesothelial cells with long microvilli on the apical surfaces of the mesothelial cell membranes - thin ‘submesothelium’ of fibrovascular tissue - cavity - lining surfaces = parietal mesothelium - examples: parietal pericardium, parietal pleura, parietal peritoneum - organ - lining surfaces = visceral mes othelium - examples: visceral pulmonary pleura, visceral pericardium (epicardium); hepatic, splenic, and intestinal visceral peritoneum ©