Comparative morphology of the iris of donkey (Equus asinus) and buffalo (Bos bubalis)

Document Type : Original Article

Authors

1 Department of Anatomy & Histology, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt.

2 Department of Anatomy & Histology, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt.

Abstract

This work was carried out on 22 eyeballs collected from two animal species namely donkey and buffalo (11 from each) to elucidate gross anatomical, light and scanning electron microscopical features of the iris in addition to some morphomet- rical characteristics. The iris constitutes a variable relative surface area (in relation to uvea) being the highest in the donkey. Breadth of the iris varies topographically. In buffaloes, the dorsal and ventral parts are wider than the medial and lateral ones with a subsequently oval pupil. In donkeys the breadth of the iris is nearly uniform encircling a semicircular pupil. The dorsal side of the pupillary border of the iris carries several variably- sized black masses (Corpora nigra). Anterior and posterior surfaces of the iris are studded by circular and longitudinal folds indicating the arrangement of constrictor and dilator pupillary muscles, respectively. The constrictor muscle occupies variable breadth of the iris indicating its myotic strength, while the thickness of the dilator indicates its medriatic efficiency.

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