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VOL. 9, ISSUE 1 (2024)
Anatomical, histological and histochemical structure of retina in little ringed plover Charadrius dubius
Authors
Hamid Hassan Hamid, Nazar Mohammed Hasan, Ameer M Taha
Abstract
The current research aimed to identify the anatomical, histological and histochemical structure of the retina one of the wild birds in Iraq, which is the little ringed plover, Charadrius dubius. To achieve this goals, ten plover birds were used, and after performing the dissection and histological preparation, four histological and histochemical stains were used to identify the results. The results showed that the retina can be divided anatomically into four regions: dorsotemporal, dorsonasal, ventrotemporal, and ventronasal. These regions differ in terms of thickness and cell density. Histologically, the retina is divided into eight distinct layers in all its regions as well as two limiting membranes. These layers are the pigmented epithelial layer, which appears to be composed of a single row of epithelial cells that are cubic to columnar in shape. The photoreceptor cell layer appeared to consist of a single row of cells of two types: rods and cones, which differ in external appearance and function. Cones, in turn, were of two secondary types: single cones and double cones. All types of photoreceptor cells were composed of two segment: outer and inner segment, which was composed of two parts: ellipsoid region and the myoid region. The remaining layers of the retina, known as the inner retina, appeared to differ in thickness between different areas of the retina. The results also showed that the retina in this bird is avascular. The retina contained several areas of specialization. Two fovea appeared in the dorsotemporal and ventronasal regions. One area centralis and two visual streak appeared in the ventrotemporal and dorsonasal regions, respectively. The study concluded that the structure of the retina is advanced in this bird and that multiple areas of specialization enable the bird to have a strong ability to see food and prey from enemies.
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Pages:18-25
How to cite this article:
Hamid Hassan Hamid, Nazar Mohammed Hasan, Ameer M Taha "Anatomical, histological and histochemical structure of retina in little ringed plover Charadrius dubius". International Journal of Zoology Studies, Vol 9, Issue 1, 2024, Pages 18-25
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