Anatomical and histological characteristics of the dromedary eye (Camelus dromedarius)

Keywords: cornea; ciliary body; lens; eyeball; iris; optic nerve; retina.

Abstract

The anatomy and features of the histological structure of the components of the eye of a one-humped camel were investigated. Ultrasound examinations of the eye, determination of the iridocorneal angle with a gynoscope were carried out on live animals in the clinic after the introduction of eye drops (xylocaine 2%, atropine sulfate 3%). The condition of the eye membranes was determined by histological methods. The studies were carried out on twenty eyeballs from ten clinically healthy adult camels, selected during slaughter in a meat processing enterprise. The anatomical and topographic features of the organ, its membranes and structures, absolute and relative mass, and linear measurements were determined. Thin histological sections of the eye wall were stained with hematoxylin and eosin, impregnated with silver nitrate, followed by examination under a microscope. In a one-humped camel, the eyelashes of both eyelids are very thick and long. The internal architectonics of the eyeball of a one-humped camel is similar to that of other animal species. The lens was found to be a transparent biconvex structure located inside the eyeball just behind the iris. The cornea of the eye occupies almost the entire visible part of the eye. The ciliary body is located behind the iris near the lens. The main functions of the ciliary body are the formation of intraocular fluid (aqueous humor), which fills the front of the eye. The ciliary body contains muscles that enable the eye to focus on objects located at different distances. A feature of the camel’s eye is the very open iridocorneal angle. The retina is built up by nerve tissue that lines the back of the eye. The retina perceives light, generates impulses that pass through the optic nerve and are sent to the brain. The histological structure of the membranes of the eye was studied after applying routine methods. It has been established that the eyes are built by various types of tissues, in particular, epithelial (epithelium of the conjunctiva), dense loose connective tissue (the corneal substance itself), loose connective tissue and pigment tissue (choroid) and nervous tissue with a layer of melanocytes and keratinocytes.

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References

Abdo, M., Hosaka, Y. Z., Erasha, A., Nada, M., Ali, S., & Uehara, M. (2013). Prenatal development of the eye tunics in the dromedary camel (Camelus dromedarius). Anatomia, Histologia, Embryologia, 43(4), 257–264.
Banks, M. S., Sprague, W. W., Schmoll, J., Parnell, J. A. Q., & Love, G. D. (2015). Why do animal eyes have pupils of different shapes? Science Advances, 1(7), e1500391.
Bess, S., & Line, B. (2016). Embryology and anatomy: spine/spinal cord. The Growing Spine, 3–13.
Bouâouda, H., Achâaban, M. R., Ouassat, M., Oukassou, M., Piro, M., Challet, E., El Allali, K., & Pévet, P. (2014). Daily regulation of body temperature rhythm in the camel (Camelus dromedarius) exposed to experimental desert conditions. Physiological Reports, 2(9), e12151.
Bourges-Abella, N., Raymond-Letron, I., Diquelou, A., Guillot, E., Regnier, A., & Trumel, C. (2007). Comparison of cytologic and histologic evaluations of the conjunctiva in the normal equine eye. Veterinary Ophthalmology, 10(1), 12–18.
Chaudieu, G., & Benard, G. (2019). Intérêt et valeur prédictive de la recherche des anomalies de l’angle irido-cornéen : renseignements fournis par l’examen gonioscopique de 4309 chiens (1998–2018). Revue Vétérinaire Clinique, 54(1), 3–21.
Cholkar, K., Dasari, S. R., Pal, D., & Mitra, A. K. (2013). Eye: anatomy, physiology and barriers to drug delivery. Ocular Transporters and Receptors, 1–36.
Coile, D. C., & O’Keefe, L. P. (1988). Schematic eyes for domestic animals. Ophthalmic and Physiological Optics, 8(2), 215–219.
Eddine, R. D., Amine, F. M., Manel, H., Khaoula, M., & Lieshchova, M. (2020). Morpho-histological study of spleen ontogenesis in lambs during antenatal and posnatal period. Journal of World’s Poultry Research, 10(1), 12–16.
Fares, M., Rahmoun, D., & Lieshchova, M. (2020). Histological study of eyelid in Algerian locale bovine. Ukrainian Journal of Veterinary and Agricultural Sciences, 3(2), 60–63.
Fowler, M. E., Smuts, M. M. S., & Bezuidenhout, A. J. (1988). Anatomy of the Dromedary. The Journal of Zoo Animal Medicine, 19(3), 136.
Garland, D., Rao, P. V., Corso, A. D., Mura, U., & Zigler, J. S. (1991). ζ-Crystallin is a major protein in the lens of Camelus dromedarius. Archives of Biochemistry and Biophysics, 285(1), 134–136.
Gherissi, D. E., Afri-Bouzebda, F., & Bouzebda, Z. (2017). Seasonal changes in the testicular morphology and interstitial tissue histomorphometry of Sahraoui camel under Algerian extreme arid conditions. Biological Rhythm Research, 49(2), 291–301.
Gibbings, S. L., & Jakubzick, C. V. (2018). Isolation and characterization of mononuclear phagocytes in the mouse lung and lymph nodes. Lung Innate Immunity and Inflammation, 33–44.
Guyomard, J.-L., Rosolen, S. G., Paques, M., Delyfer, M.-N., Simonutti, M., Tessier, Y., Sahel, J. A., Legargasson, J.-F., & Picaud, S. (2008). A low-cost and simple imaging technique of the anterior and posterior segments: eye fundus, ciliary bodies, iridocorneal angle. Investigative Opthalmology & Visual Science, 49(11), 5168.
Jia, C., Zhang, F., Zhu, Y., Qi, X., & Wang, Y. (2017). Public data mining plus domestic experimental study defined involvement of the old-yet-uncharacterized gene matrix-remodeling associated 7 (MXRA7) in physiopathology of the eye. Gene, 632, 43–49.
Kassab, A. (2011). Ultrasonographic and macroscopic anatomy of the enucleated eyes of the buffalo (Bos bubalis) and the one-humped camel (Camelus dromedarius) of different ages. Anatomia, Histologia, Embryologia, 41(1), 7–11.
Koizumi, N., Okumura, N., & Kinoshita, S. (2012). Development of new therapeutic modalities for corneal endothelial disease focused on the proliferation of corneal endothelial cells using animal models. Experimental Eye Research, 95(1), 60–67.
Lossi, L., D’Angelo, L., De Girolamo, P., & Merighi, A. (2016). Anatomical features for an adequate choice of experimental animal model in biomedicine: II. Small laboratory rodents, rabbit, and pig. Annals of Anatomy - Anatomischer Anzeiger, 204, 11–28.
Malhotra, A., Minja, F. J., Crum, A., & Burrowes, D. (2011). Ocular anatomy and cross-sectional imaging of the eye. Seminars in Ultrasound, CT and MRI, 32(1), 2–13.
Micheau, A., & Hoa, D. (2016). Dog - General anatomy (Illustrations). Vet-Anatomy.
Mohammad, A. A. (2008). Anatomical characteristics of dorsal lacrimal gland in one humped camel (Camelus dromedarius). Journal of Biological Sciences, 8(6), 1104–1106.
Noor, N. A., & El-bably, S. H. (2018). Anatomical studies on the arterial supply of the eye in the one- humped camel (Camelus dromedarius). International Journal of Anatomy and Research, 6(1.3), 5057–5063.
Ofri, R. (2008). Retina. Slatter’s Fundamentals of Veterinary Ophthalmology, 285–317.
Petit, L., & Pouget, P. (2019). The comparative anatomy of frontal eye fields in primates. Cortex, 118, 51–64.
Rahi, A. H. S., Sheikh, H., & Morgan, G. (1980). Histology of the camel eye. Cells Tissues Organs, 106(3), 345–350.
Tavousi, H., Saadatlou, M. A. E., & Keyhanmanesh, R. (2013). A study of the histogenesis of sheep fetus iris. Kafkas Universitesi Veteriner Fakultesi Dergisi.
Thomasy, S. M., Eaton, J. S., Timberlake, M. J., Miller, P. E., Matsumoto, S., & Murphy, C. J. (2016). Species differences in the geometry of the anterior segment differentially affect anterior chamber cell scoring systems in laboratory animals. Journal of Ocular Pharmacology and Therapeutics, 32(1), 28–37.
Verra, D. M., Sajdak, B. S., Merriman, D. K., & Hicks, D. (2020). Diurnal rodents as pertinent animal models of human retinal physiology and pathology. Progress in Retinal and Eye Research, 74, 100776.
Vézina, M. (2012). Comparative ocular anatomy in commonly used laboratory animals. Molecular and Integrative Toxicology, 1–21.

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Published
2020-06-10
How to Cite
Rahmoun, D. E., Lieshchova, M. A., Gherissi, D. E., & Hadjeris, T. (2020). Anatomical and histological characteristics of the dromedary eye (Camelus dromedarius). Theoretical and Applied Veterinary Medicine, 8(2), 132-138. https://doi.org/10.32819/2020.82018