Fatime GEYİKOĞLU, Özgen VURALER, Aysel TEMELLİ

Histological, histochemical and ultrastructural investigations on the esophagus of juvenile rainbow trout (Oncorhynhus mykiss)

Oncorhynchus mykiss özofagusunun histolojisi çalışılmıştır. Onun özofagusunun yapısı önceki çalışmalarla karşılaştırıldığında benzerlikler kadar farklılıklar da göstermiştir. Bu çalışmada balığın özofagusundaki tunika muskularis eksterna'nın histokimyasal ve Ultrastrüktürel yapısı araştırılmıştır. Kas lifleri mATP az aktivitelerinin pH dayanıklılığına göre kırmızı ve orta lifler olarak tanımlanmıştır. Orta lifler süksinik dehidrojenaz (SDH) ve toluidin mavisi ile orta düzeyde boyanma gösterirken, kırmızı lifler yoğun boyanma göstermiştir. Ayrıca, tunika muskularis eksterna'da küçük çaplı lifler görülmüştür. Bunlar, jüvenil evre süresinde özofagusun yapı ve görev bakımından gelişmesinin devamlı olduğunu göstermiştir. Kırmızı ve orta liflerin sarkomerleri, Z çizgileri, mitokondrileri, triadları ve miyofîbrillerinin Ultrastrüktürel organizasyonları birbirinden farklı bulunmuştur. Orta liflerin miyofibrilleri belirgin farklılıklar göstermiştir. Sonuç olarak, tunika muskularis eksterna'nın histokimyasal ve Ultrastrüktürel özelliklerinin özel fonksiyonel ihtiyaçlara göre özofagusun çalışmasını en iyi düzeye getirdiği düşünülmüştür.

Genç gökkuşağı alabalığı (Oncorhynhus mykiss) özofagusunda histolojik, histokimyasal ve ultrastrüktürel araştırmalar

The histology of the esophagus of Oncorhynchus mykiss was studied. The structure of the esophagus exhibited differences as well as similarities when compared with previous studies. In this study, the histochemical and ultrastructural structure of the tunica muscularis externa in the esophagus of this fish is investigated. The muscle fibers are described as red and intermediate fibers according to the pH stability of their mATPase activities. The red fibers showed intense staining, while intermediate fibers showed moderate staining with succinic dehydrogenase (SDH) and toluidine blue. In addition, small diameter fibres were seen. These indicated to be the continuation of development during the structure and function of the esophagus in the juvenile phase. Ultrastructural organization of sarcomeres, Z lines, mitochondria, triads and myofibrils of red and intermediate fibers were different from each other. The myofibrils of intermediate fibres showed clear differences. As a result, it is thought that the histochemical and ultrastructural characteristics of the tunica muscularis externa optimize the performance of the esophagus according to specific functional requirements.

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