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  2. File:FMIB 52615 Diagram of water-vascular system of a ...

    en.wikipedia.org/wiki/File:FMIB_52615_Diagram_of...

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  3. Water vascular system - Wikipedia

    en.wikipedia.org/wiki/Water_vascular_system

    The ring canal has several small stone canals, located between the arms of the animal, but these open into the body cavity, and thus are only indirectly connected to the outside. [ 11 ] : 1004 The five radial canals run into the arms and branch several times to supply all of the individual branches and pinnules lining the arms.

  4. Starfish - Wikipedia

    en.wikipedia.org/wiki/Starfish

    While a starfish lacks a centralized brain, it has a complex nervous system with a nerve ring around the mouth and a radial nerve running along the ambulacral region of each arm parallel to the radial canal. The peripheral nerve system consists of two nerve nets: a sensory system in the epidermis and a motor system in the lining of the coelomic ...

  5. Echinoderm - Wikipedia

    en.wikipedia.org/wiki/Echinoderm

    Diagram of water vascular system of a starfish, showing the ring canal, the radial canals, ampullae (small bulbs), and tube feet. Echinoderms possess a unique water vascular system, a network of fluid-filled canals modified from the coelom (body cavity) that function in gas exchange, feeding, sensory reception and locomotion.

  6. Madreporite - Wikipedia

    en.wikipedia.org/wiki/Madreporite

    Its main parts are the madreporite, the stone canal, the ring canal, the radial canals, the lateral canals, and the tube feet. The sieve-like madreporite allows entry of seawater into the stone canal, which connects to the ring canal around the mouth. Five or more radial canals extend from the ring canal, one in each arm above the ambulacral ...

  7. Ossicle (echinoderm) - Wikipedia

    en.wikipedia.org/wiki/Ossicle_(echinoderm)

    Ossicles are small calcareous elements embedded in the dermis of the body wall of echinoderms.They form part of the endoskeleton and provide rigidity and protection. They are found in different forms and arrangements in sea urchins, starfish, brittle stars, sea cucumbers, and crinoids.

  8. Tube feet - Wikipedia

    en.wikipedia.org/wiki/Tube_feet

    Tube feet (technically podia) are small active tubular projections on the oral face of an echinoderm, such as the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers; they are more discreet though present on brittle stars, and have only a feeding function in feather stars. They are part of the water vascular system.

  9. Cleithrum - Wikipedia

    en.wikipedia.org/wiki/Cleithrum

    The larger bone is the cleithrum. The cleithrum (pl.: cleithra) is a membrane bone which first appears as part of the skeleton in primitive bony fish, where it runs vertically along the scapula. [1] Its name is derived from Greek κλειθρον = "key (lock)", by analogy with "clavicle" from Latin clavicula = "little key".