Primary Body Cavity

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Primary Body Cavity

the space containing the internal organs, situated between the body wall and the intestine in certain multicellular animals. The primary body cavity is well developed only in the phyla Nemathelminthes; here it has no cell wall. In mollusks, the primary body cavity is a system of lacunae and sinuses; in higher multicellular animals it has been superseded by the secondary body cavity, or coelom. In the phyla Arthropoda the vestiges of the primary body cavity, merging with the reduced coelom during embryonic development, form the mixed body cavity, or mixocoel. In embryos of animals in the blastula stage, the primary body cavity is called the blastocoel.

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No references found			Primachenko, Mariia Avksentevna primacord Primacy Primakoff, Henry Primakov, Evgenii Primakov, Evgenii Maksimovich Primakov, Vitalii Primakov, Vitalii Markovich Primakov, Yevgeny Maksimovich primaquine primary Primary Accounting primary air primary alcohol primary amine Primary and Secondary Qualities primary arc primary area primary atypical pneumonia primary basalt primary battery primary beam primary biliary cirrhosis primary blasting primary body Primary Body Cavity primary branch primary breaker primary cache primary carbon atom primary cell primary center Primary Chronicle primary circle primary circuit primary circulation primary circulation areas primary clay primary coil Primary Colors primary compression primary compression failure primary consolidation primary constriction primary consumer primary contract primary control program Primary Cortex primary cosmic rays primary crater primary creep			Primary axis Primary balance primary basalt Primary batteries Primary batteries Primary batteries Primary battery Primary battery Primary battery primary beam primary beam primary beam primary beam primary bilateral micronodular hyperplasia Primary Bile Acid Malabsorption primary bile acids primary bile acids primary bile acids primary bile acids Primary biliary cirrhosis Primary biliary cirrhosis Primary biliary cirrhosis Primary biliary cirrhosis Primary Biological Aerosol Particle Primary Bipolar Affective Disorder primary blasting primary bloat primary bloat primary bloat primary body Primary Body Cavity Primary Body Waves primary bond primary bond primary bond primary bond primary bond Primary Bone Marrow Macrophages Primary Boot Record primary brain tumor primary brain v's primary brain v's primary brain v's primary brain vesicle primary brain vesicles primary brain vesicles primary brain vesicles Primary Branch Primary Branch primary breaker primary bronchial buds primary bronchus primary c primary c primary c primary c primary cache Primary cancer Primary cancer Primary cancer Primary cancer

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