tube feet

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tube feet

the locomotory organs of ECHINODERMS that are protruded from the body by, and are retracted by, fluid pressure from the water-vascular system.
References in periodicals archive ?
Swims in response to contact with a sea star tube foot lasted an average of 53.
A microscope equipped with a camera lucida was used to trace, from sections, the outline of the internal and external surface of the tube foot, the profile of the valve tissue, and the position of the valve muscle fibers.
Most of the tube foot is external to the body wall [ILLUSTRATION FOR FIGURE 2 OMITTED].
The tube foot epithelium is covered by a thin cuticle continuous with that covering adjacent areas of the ambulacrum (See Engster and Brown, 1972, for details).
Such an array consists of connective tissue fibers that wrap the tube foot in both left-and right-hand helices.
The internal lumen of the tube foot is lined with epithelium (see Wood and Cavey, 1981, for details).
clathrata and A articulatus the ampullae are bilobed, one lobe extending laterally from the union with the tube foot and the order extending medially [ILLUSTRATION FOR FIGURES 2, 5 OMITTED].
Short lateral canals extend from each side of the radial canal to connect to each tube foot along the length of the arm [ILLUSTRATION FOR FIGURE 7 OMITTED].
The lateral canal joins the tube foot wall at the top of the tube foot.
Hemal tissue extends laterally to each tube foot [ILLUSTRATION FOR FIGURE 18 OMITTED] where it appears to join, near the valve, with the middle connective tissue layer of the appendage.
It was found that surgical obliteration of the madreporite, ampulla, and lower stone canal had very little effect on tube foot function for at least a week.
If tube foot inflation and body fluid content are maintained by osmotic elevation, as by a potassium ion pump in the tube feet (cf.