. The Biological bulletin. Biology; Zoology; Marine biology. SEA URCHIN CATCH APPARATUS 239 ca. 2mm. |jm Figure 2. Schematic diagram produced by del Castillo et al. (12) to illustrate their new model, showing the "relaxed" ligament (R) and "contracted" ligament (C). The authors assume that the small fibers (solid parallel rods) are discontinuous and that adjacent small fibers are connected only by muscle cells (stippled lines). It should be noted that the latter is impossible, since it would result in the muscle cells having to sustain the whole of any load that
. The Biological bulletin. Biology; Zoology; Marine biology. SEA URCHIN CATCH APPARATUS 239 ca. 2mm. |jm Figure 2. Schematic diagram produced by del Castillo et al. (12) to illustrate their new model, showing the "relaxed" ligament (R) and "contracted" ligament (C). The authors assume that the small fibers (solid parallel rods) are discontinuous and that adjacent small fibers are connected only by muscle cells (stippled lines). It should be noted that the latter is impossible, since it would result in the muscle cells having to sustain the whole of any load that was being applied to the ligament. It is known, however, that the tensile strength and stiffness of the ligament are close to those of mammalian tendon (see text). This interpretation thus admits no role whatsoever for connective tissue mutabiUty in the functioning of the CA. The new model does not explain the catch phenomenon At this stage there is a need to recall the essential ele- ments of the catch phenomenon as manifested by the CA. When a spine-test joint is in the mobile condition, the spine can be inclined by the differential contraction of the spine muscle on one side. To allow th's to happen, the CA must stretch on the opposite side (see Fig. 3). As is acknowledged by del Castillo et al, this can occur only by the elongation of the large fibers. When a joint is im- mobilized in the catch condition, the CA has a high stretch. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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