. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOLOTHUROID CUVIER1AN TUBULE REGENERATION 41. Figure 16. Hololhuria forskali. Reconstruction of a longitudinal sec- tion through the wall of a stage 3 regenerating Cuvierian tuhule (not to scale). BL. basal lamina: BP, epithelial cell basal process; C, cilium; CL. connective tissue layer; IE, internal epithelium; M. mesothelium; MC, myocyte; ME, bundle of myofilaments; MV. mierovillus; NP. nerve plexus; P2. type 2 pseudopodial cell: PC. peritoneocyte: UC. undilt'erentiated cell. ules that range from to /urn in diamet
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOLOTHUROID CUVIER1AN TUBULE REGENERATION 41. Figure 16. Hololhuria forskali. Reconstruction of a longitudinal sec- tion through the wall of a stage 3 regenerating Cuvierian tuhule (not to scale). BL. basal lamina: BP, epithelial cell basal process; C, cilium; CL. connective tissue layer; IE, internal epithelium; M. mesothelium; MC, myocyte; ME, bundle of myofilaments; MV. mierovillus; NP. nerve plexus; P2. type 2 pseudopodial cell: PC. peritoneocyte: UC. undilt'erentiated cell. ules that range from to /urn in diameter and often occur in the vicinity of a large Golgi apparatus and of a well-developed RER (Fig. 17). Many of the cisternae of the RER are distended and filled with an amorphous material. The nucleus is egg-shaped and usually located in the lower- most part of the cell (, at the base of the pleats). No cellular junctions were observed between the granular cells or between the granular cells and peritoneocytes. However, the granular cells attach to the basal lamina through a hemidesmosome-like structure. Myocytes are located either in the most basal part of the mesothelium ( at the base of the folds), or here and there within the connective tissue layer, where they form an intraconnective muscle layer (Figs. 17, 20). The circular myocytes are always basal to the longitudinal ones. A single basal lamina lines both types of myocytes as well as the rest of the mesothelium. A well- developed nerve plexus is present and is mostly associated with the longitudinal myocytes, whether they are intrame- sothelial or within the connective tissue (Figs. 17, 20). The thick connective tissue layer is, from place to place, divided into an outer area and an inner area by the presence of the intraconnective muscle layer. The outer area is thin (about 12 /urn thick) and encloses very few collagen fibers and cells. The inner area, on the other hand, is much thicker (about 120 jum thick): it
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
