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Anatomical, histological and computed tomography comparisons of the eye and adnexa of crab-eating fox (Cerdocyon thous) to domestic dogs


Autoři: Nayone Lima Lantyer-Araujo aff001;  Danielle Nascimento Silva aff001;  Alessandra Estrela-Lima aff002;  Caterina Muramoto aff002;  Fernanda de Azevedo Libório aff003;  Érica Augusta da Silva aff001;  Arianne Pontes Oriá aff002
Působiště autorů: Post-Graduate Program in Animal Science in the Tropics, School of Veterinary Medicine and Zootechny, Federal University of Bahia (UFBA), Salvador, Bahia, Brazil aff001;  Department of Veterinary Anatomy, Pathology and Clinics, School of Veterinary Medicine and Zootechny, UFBA, Salvador, Bahia, Brazil aff002;  Screening Center for Wild Animals, Brazilian Institute of the Environment and Renewable Natural Resources, Salvador, Bahia, Brazil aff003
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0224245

Souhrn

An understanding of species' morphological and physiological parameters is crucial to developing conservation strategies for wild animals kept in human care. Detailed information is lacking for crab-eating fox (Cerdocyon thous) eyes and adnexa. Therefore, the aim of this study was to describe anatomical, histological and computed tomography (CT) features of the eye and adnexa in crab-eating fox, compared to domestic dogs. CT of the eye and adnexa of one live animal and a frozen specimen was performed for anatomical identification. In addition, the heads of five animals of each species were fixed in 10% buffered formalin for gross anatomical description of the eye and adnexa using topographic dissection and exenteration techniques. All steps were photographed and features such as location, shape, and distances and relationships between structures were described. For histological evaluation, two eyes of each species were fixed in 10% buffered formalin, processed by routine paraffin inclusion technique and stained with hematoxylin and eosin. The CT scan was difficult to evaluate, mainly that of the frozen head, which did not provide good definition of the soft tissues; nevertheless, it demonstrated the potential for structure visualization and description. The gross anatomical and histological evaluations showed the presence of eyelashes on the upper eyelid and of upper and lower lacrimal points, an incomplete orbit with supraorbital ligament, slightly exposed sclera with discretely pigmented limbus and pigmentation throughout the conjunctiva, and a slit-shaped pupil. Hematoxylin and eosin staining demonstrated structural similarities between the crab-eating fox and domestic dog. Thus, the possibility of using the domestic dog as a study model for the preventive and therapeutic management of wild dogs kept in human care is demonstrated.

Klíčová slova:

Computed axial tomography – Dogs – Domestic animals – Eye muscles – Eyes – Pets and companion animals – Animal ocular anatomy


Zdroje

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