. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 40 I) \ \NDI \SPII i ,11 / / W. Figures 11-15. Hulmhurui lurxkuli. IMliastiucture ul stage 3 regenerating Cuvierian tubules. BL. basal lamina: BP. epithelial cell hasal process; CE, centriolc. CL. connccli\c tissue layer: CM. circular myocyte; IE. internal epithelium; G. Golgi apparatus: I., lumen: LM. longitudinal myocyte; MC. myocyte; N, nucleus; NP, nerve plexus: ]'2. l\pe 2 pseudopodial cell: PC. pciitoin'oc\te: SI., secondary lysosumc. TC. unditterenlialed cell. Figure 11. Longitudinal section through the mesothelium (b
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 40 I) \ \NDI \SPII i ,11 / / W. Figures 11-15. Hulmhurui lurxkuli. IMliastiucture ul stage 3 regenerating Cuvierian tubules. BL. basal lamina: BP. epithelial cell hasal process; CE, centriolc. CL. connccli\c tissue layer: CM. circular myocyte; IE. internal epithelium; G. Golgi apparatus: I., lumen: LM. longitudinal myocyte; MC. myocyte; N, nucleus; NP, nerve plexus: ]'2. l\pe 2 pseudopodial cell: PC. pciitoin'oc\te: SI., secondary lysosumc. TC. unditterenlialed cell. Figure 11. Longitudinal section through the mesothelium (bar 3 fimi Figure 12. Detailed view of ihe myocytes (bar = 3 /nm). Figure 13. Intraconnective type 2 pseudopodial cells (bar = 3 jtm). Figure 14. Detailed \ieu ul a t\pe 2 pseudopodial cell (bar = ). Figure 15. Transverse section through the inner epithelium (bar = 3 jxm). served contacting the intraconnective hasal processes of the circular myocytes (Fig. 13). Type 2 pseudopodial cells have a high nuclear-cytoplasmic ratio. Their reduced perinuclear cUoplasm encloses a Golgi apparatus as well as a pair of centrioles (Fig. 14). The inner epithelium is only slightly different from that seen in stage 2. The epithelial cells have a more irregular shape and develop two to three hasal processes penetrating the underlying connective tissue layer (Figs. 15. 16). These processes are lined hy the hasal lamina hut. as previously. there is no attachment structure hetween the epithelial cells and this hasal lamina. Slum' 4. At this si. i •.•eneration. the mesothelium develops transversal folds that penetrate the connective tis- sue layer (Figs. 17, 20). Three cell types may he recogni/.ed in ihe mesothelium: peritoneocytes, granular cells, and mxocytes. The undifferentiated cells are no longer present. IVnioneocytes form the coelomic lining and always cover the granular cells. They are tuck-shaped \\nli a llatlened apical part and a thin elongated hasal part. They are now attach
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
