. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100 P. EMSCHERMANN. Figure 4. a: Cross section of the extrudible hollow thread; the cutieular core (arrows) is traversed by epithelial microvilli (arrowheads), and the cruciform luminal surface of the cutieular tube is decorated by the blister-like microvilli tips (double arrowheads); secretion vesicles (*) are seen attached to the cytoplasmic side of the cutieular core. At the four edges of the cutieular core the membranes of the four adjacent capsular cells, connected by desmosomes, can be seen, b: Edge of one arm of the x
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100 P. EMSCHERMANN. Figure 4. a: Cross section of the extrudible hollow thread; the cutieular core (arrows) is traversed by epithelial microvilli (arrowheads), and the cruciform luminal surface of the cutieular tube is decorated by the blister-like microvilli tips (double arrowheads); secretion vesicles (*) are seen attached to the cytoplasmic side of the cutieular core. At the four edges of the cutieular core the membranes of the four adjacent capsular cells, connected by desmosomes, can be seen, b: Edge of one arm of the x-shaped cross section shown in a. demonstrating the subcuticular membranes ot two adjacent capsular cells connected by desmosomes (arrows), c: Sectioned subepidermal nerve libers (*) beside the capsular neck, partly filled with synaptic vesicles; ca: capsular cell; ep: epidermal cell, d: Longitudinal section through the neck of a lime-twig capsule; at either side (circled area) desmosome-stabilized junctions between capsular cells (ca) and adjacent epidermal cells (ep) are seen; mi: microvillous border of capsular cells in the mouth funnel, e: Circled area of d in higher magnification showing interdigitations and desmosomes between capsular cell (ca) and epidermal cell (ep) (Scale bars: 1 ^m). out, presumably because the material had been stored aboard ship in the fixative for several months before post- fixation and embedding. Microscopy Microscopical investigations were carried out in Freiburg because shipboard microscopical work at higher magnification turned out to be impossible. The light microscopical evaluation of the material was car- ried out with Zeiss-Nomarski interference contrast equipment. For ultrastructural examination, the spec- imens, after postfixation in buffered 2% OsO4, were embedded in Epon, sectioned with a diamond knife, and examined under a Zeiss EM 9A electron micro- Please note that these images are extracted from scanned page images that may
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
