. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 366 MICHAEL J. SMITH the body wall. The tunic matrix material of natural hold-fast stolon is irregular and tunic papillae and spines are absent although a dense staining cuticular sur- face is evident. In the laboratory, stolon material grows freely and rapidly, cir- cumscribing the base of the ascidian. Over several months, these stolons will grow to lengths of approximately 1 mm and to diameters of to mm. The tunic matrix fibers of laboratory stolon show more regularity of strvicture than does the natural stolon ma
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 366 MICHAEL J. SMITH the body wall. The tunic matrix material of natural hold-fast stolon is irregular and tunic papillae and spines are absent although a dense staining cuticular sur- face is evident. In the laboratory, stolon material grows freely and rapidly, cir- cumscribing the base of the ascidian. Over several months, these stolons will grow to lengths of approximately 1 mm and to diameters of to mm. The tunic matrix fibers of laboratory stolon show more regularity of strvicture than does the natural stolon matrix. At the distal tip of the laboratory grown stolon, the matrix material is quite thin and irregular (Fig. 6A). Proceeding from this tip along the stolon to the body of the animal there is an increase in the thickness of the matrix and an increase in the regularity of fibrous structure, until the matrix assumes a laminar appearance like that found in body wall tunic. The growing tip of laboratory stolon is covered with a thin cuticle, but near the body of the animal, papillae and cuticular spines are evident. There is a gradation of development of matrix, papillae, and cuticular spines from the distal tips of stolons to its juncture with the body wall. DV. FIGURE 6. Laboratory grown stolon and injured body wall tunic of H. tiitraiitiuin stained with Gomori's hematoxylin and phloxine. Plates A (200 X) and B (1000X) are cross sections of stolon near the growing tip; note the aggregation of mature morula cells (MM) and dispersing vesicular cells (DV) peripherally and the lack of lamination of the tunic matrix (Ma). Plates C (100 X) and D (50 X) are cross sections of tunic five days after injury. In plate D the epidermis is to the bottom; note the dark staining mature morula cell degradation products (MD) throughout the wound area and the constriction of laminae (LC) at the sides of the wound. The following additional notation is used: SB, subepidermal blood space; LI, limits of
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
