| 11. | Enterocoelous development is the stage of embryological development of deuterostomes in which the coelom forms.
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| 12. | The coelom of the body forms from a split of the mesoderm along the somite axis.
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| 13. | The second circulatory system derives from the cells of the digestive system that line the coelom.
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| 14. | Pedicles of inarticulate species are extensions of the main coelom, which houses the internal organs.
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| 15. | This is the part extending from the protocele, ie the uppermost portion of the coelom.
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| 16. | Haemal and perihaemal systems are derived from the coelom and form an open and reduced circulatory system.
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| 17. | Some of the body cavities degenerate but others become the water vascular system and the visceral coelom.
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| 18. | The muscular layers are longitudinal and circular, and part of the fluid-filled coelom within.
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| 19. | Some of the ( lesser known ) animals with true coeloms shared both deuterstome and protostome traits.
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| 20. | In bilaterally symmetrical organisms there is often a major mesentery separating the two halves of the coelom.
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