Anatomical Descriptions and Histological Observation Study of the Eyes in Domesticus Duck (Anas platyrhnchos)
Anatomical Descriptions and Histological Observation Study of the Eyes in Domesticus Duck (Anas platyrhnchos)
Mohammed A. Ali1*, Firas A. Alhasson1, Thaer A. Mohsin2
ABSTRACT
The eyes of birds play a crucial role in vision as well as other physiological activities including eating and movement. The eyes of the duck (Anas platyrhnchos) were studied in terms of anatomical and histological features in this study. From the exterior to the inside, light microscopic studies revealed that the eye of Anas platyrhnchos was made up of three layers: (a) the External layer (fibrous ) (the sclera and cornea); (b) the Middle layer (Vascular) the choroid, ciliary body, and iris and (c) Internal layer (Nervous) the retina. A squamous corneal epithelium, the stroma, and the corneal endothelium were all well-defined layers of the cornea. Anas platyrhnchos’ lens was spherical and encased by a lens capsule, with a monolayer of epithelial cells covering its anterior surface. Unlike terrestrial animals, the posterior sclera was made up of a cartilaginous cup contained in a collagenous matrix. The retina was avascular, and the layers of the retina were arranged in a normal vertebrate pattern.
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