Comparative histological study on the tracheas of goose, duck and pigeon [electronic resource].
- P. 160-190.
Includes references.
Twenty-five healthy male and female birds (8 of goose, 8 of ducks and 9 of pigeons) were used in this work. Tracheas of them were fixed and processed till 7 micrometer thick paraffin sections were prepared and stained with different stains. The results revealed that tracheas of goose and duck contained ossified circular overlapping rings, while those of pigeons contained non-ossified cartilaginous rings. The diameters, length and thickness varied in different studied species. The tracheal skeletal muscles attached to the lateral sides of tracheal rings. The lining epithelium of all tracheas was respiratory type with fine goblet cells that were alcianophilic or PAS positive. In some areas were present intraepithelial acini in goose and duck. In pigeon, the intraepithelial acini increased in size and bulged deeply in the propria but there were no submucosal glands in all studied birds.The ossified regions of the tracheal rings of duck and goose revealed bone marrow spaces with hematopoietic tissue or even adepocytes. Tracheal rings were connected with each other by fibrous annular ligaments with silver impregnation the reticular fibers were progressively present in the tracheal rings, muscles and adventitia. The lacunae of chondrocytes of non-ossified regions of tracheal rings in duck and goose showed alcianophilia. Other results were mentioned and discussed.