Attaai Abdelraheim H, Hussein Manal T, Aly Khaled H, Abdel-Maksoud Fatma M
Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Assiut University, Assiut 71526, Egypt.
Department of cell and tissues, Faculty of Veterinary Medicine, Assiut University, Assiut 71526, Egypt.
Microsc Microanal. 2022 May 6:1-14. doi: 10.1017/S1431927622000666.
The donkey is mainly used as a working animal for riding and pack transport, as well as for dairy and meat production. Eye afflictions are common in donkeys, thus requiring a detailed study. A few studies had focused on the donkey's eye, and most of them had considered it, merely, a horse's eye. This study aimed to investigate the anatomy, histology, ultrastructure, and immunohistochemical features of the donkey's eye. The results were recorded and compared to those of horses in certain dimensions. Unlike horses, the donkey's eye is more circular in the contour of the cornea, has smaller lenticular thickness, and has longer anterior and vitreous chambers. Positive immunoreactivity to acidic fibroblast growth factor in the basal cell layers of the cornea was observed, indicating their role in cell differentiation and the renewal of the epithelium. Moreover, the corneal keratocytes expressed angiotensin-converting enzyme, which plays a role in corneal homeostasis and wound healing. Additionally, telocytes, hyalocytes, and other immune cells were observed within the iris and ciliary processes. Hence, this work is an updated detailed study of the morphology and ultrastructure of the donkey's eye and reveals some similarities and dissimilarities to the horse's eyes, which should be considered in clinical practice.
驴主要用作役畜，用于骑行和驮运，也用于产奶和肉用生产。眼部疾病在驴中很常见，因此需要进行详细研究。少数研究关注过驴眼，但大多数研究仅仅将其视为马眼。本研究旨在调查驴眼的解剖学、组织学、超微结构和免疫组化特征。记录结果并在某些方面与马的结果进行比较。与马不同，驴眼角膜轮廓更呈圆形，晶状体厚度较小，前房和玻璃体腔更长。在角膜基底细胞层观察到对酸性成纤维细胞生长因子的阳性免疫反应，表明它们在细胞分化和上皮更新中的作用。此外，角膜角膜细胞表达血管紧张素转换酶，其在角膜内环境稳定和伤口愈合中起作用。此外，在虹膜和睫状体中观察到了端细胞、透明细胞和其他免疫细胞。因此，这项工作是对驴眼形态和超微结构的最新详细研究，揭示了与马眼的一些异同，临床实践中应予以考虑。
