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Histology of the Body Wall of the Piscine Leech, Cystibranchus mastacembeli （Hirudinea： Piscicolidae）

Journal of Agricultural Science and Technology(B) 2013年第2期3卷 136-143页

作者： zohair ibraheem fattohy rahemo Narmin Rafiq Hamad Department of Biology College of Science University of Mosul Mosul Iraq Department of Biology College of Science University of Salahaddin Erbil Kurdistan lraq

The histology of the body wall of the fish parasitic leech, Cystibranchus masstacembeli rahemo, 1989 collected from freshwater eel, Mastacembelus simach was investigated. The body wall found consists of five layers, namely： cuticle, epidermis, dennis, muscle layer and botryoidal tissue. Cuticle is very thin layer, casting was evident in some sections, annulation was also seen in longitudinal sections, some time with sensory structures inside the crypts. Epidermis with hammer-shaped ceils, these cells are broad towards the outer and narrower towards their inner ends. In some sections intensively stained haematoxylin-eosin granules from which neck-like tubes leads with filiform projections outward to open to the exterior by minute apertures. Dermis is thicker than epidermis, with distinct large cells connected by a connective tissue and some muscle fibers, also large vacuoles or empty vesicles were detected which are haemocoelomic capillaries, which along with those situated in the epidermis make a respiratory membrane of this leech. Muscle layer consists of outer circular and inner longitudinal, the later is more abundant and occupies more space than the circular. Botryoidal tissue fills the spaces between body wall and inner intestinal or crop diverticulae, its tissue is composed of more or less rounded cells, more eosinophilic cytoplasm but with dark nuclei, intermingled with small oblique or radial muscle fibers, haemocoelomic spaces were also evident in this layer.

关键词： Histology body wall fishes

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