| 41. | Some sponges overcome this limitation by adopting the " syconoid " structure, in which the body wall is pleated.
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| 42. | Many sea cucumbers have papillae, conical fleshy projections of the body wall with sensory tube feet at their apices.
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| 43. | It moves mainly by peristaltic action of its body wall, assisted to a limited extent by its tube feet.
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| 44. | Laparoscopic surgery is performed using a camera and instruments placed through small incisions ( ports ) in the body wall.
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| 45. | Many of the mesenteries project into the enteric cavity but some extend from the body wall to the central stomodaeum.
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| 46. | The Vestimentiferan tubeworms build the external chitin structure themselves by secreting chitin from specialized glands located in their body walls.
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| 47. | Because much of the bowel is not anchored to the body wall, it is free to move out of position.
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| 48. | There are no nephridia ( " little kidneys " ) or other diffuses out through the body wall and lophophore.
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| 49. | The integumentary nephridia lie attached to the inner side of the body wall in all segments except the first two.
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| 50. | Inside the body wall is the coelom which is divided by three longitudinal mesenteries which surround and support the internal organs.
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