Estudo morfológico do sistema respiratório do Quati

Abstract

The objective of this work was to describe the macroscopic and microscopic morphology of the respiratory organs of the coati (Nasua nasua). Five animals from the CECRIMPAS Scientific Creatory (UNIFEOB) were used. The euthanized animals were fixed in a 10% formaldehyde solution for dissection. The respiratory devices of coatis were analyzed, measured and photo-documented. For light microscopy, fragments of the respiratory organs were collected, which were processed according to routine histology techniques and stained with hematoxylin and eosin and also Toluidine blue. In the coati the nose is located in the nasal plane, with a pointed shape and facing upwards. Internally it has the dorsal and ventral nasal concha which are separated by the dorsal and ventral nasal meatus. The larynx has four cartilages: arytenoid, cricoid, epiglottis and thyroid. The trachea contains tracheal rings separated by the tracheal ligament and is internally lined by the ciliated pseudo-stratified epithelial tissue. The lungs are subdivided into lobes by interlobar fissures, the right lung is divided into four lobes and is larger than the left, while the left lung has only two lobes. Microscopically, the primary, secondary and tertiary bronchi have the same constitution as the lining of the trachea. We conclude that the coati respiratory system is similar to the findings described in the literature for domestic carnivores.