İsmail Önder ORHAN

İngiliz atında arteria ophthalmica externa'nın çıkış, seyir ve dallanması

Araştırma ile İngiliz atında bulbus oculi'nin vaskularizasyonunu sağlayan a. ophthalmica externa'daki farklılıkların tespit edilmesi amaçlandı. Çalışmada erkek dört adet ergin İngiliz atı kullanıldı. Bulbus oculi ekvator kısmından anterior ve posterior olarak ikiye ayrıldığında posterior kısmında anterior kısma kıyasla kan damarlarının daha fazla olduğu gözlendi. A. ophthalmica externa üzerinden ayrılan a. lacrimalis ile a. supraorbitalis'in ortak damar kökünün farklı noktalardan ayrıldığı saptandı. Dördüncü materyalde a. ophthalmica externa ile a. ophthalmica interna arasındaki ramus anastomoticus cum. a. ophthalmica interna'nın sol tarafta bulunmadığı görüldü. A. ciliaris anterior dorsalis genelde ikiye ayrıldığı halde birinci materyalde üçe, dördüncü materyalde de beş ayrı dala ayrılarak bulbus oculi'ye girdiği belirlendi. Kullanılan materyallerde yaş ve cinsiyet farkı olmadığı halde bulbus oculi'nin vaskularizasyonunda varyasyonların olduğu tespit edildi.

Origin, course and branching of the external ophthalmic artery in English horse

The aim of this study was to establish the differences of the external ophtalmic artery which provided the vascularization of the eyeball in English horse. Four adult male English horse were used in this study. It was found that the common branch of lacrimal and supraorbital artery exits from different spots on external ophtalmic artery. Anastomatic branch that takes place between internal and external ophtalmic artery was shown in all materials except one samples. In that sample this anastomotic branch could not be observed on the left side. The dorsal anterior ciliar artery was divided usually into two branches while it was gaven three branches in first material and five branches in fourth material. Although there was no age or gender differences in the samples, variations of vascularization of the eyeball was noted.

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1. Anderson BG, Anderson WD (1977): Vasculature of the equine and canine iris. Am J Vet Res, 38, 1791-1799.
2. Barone R (1993): Anatomia Comparata Dei Mammiferi Domestici. Vol.5, Ediz Agricole Delia Calderini, Bologna.
3. Colles CM, Cook WR (1983): Carotid and cerebral angiography in the horse. Vet Rec, 113, 483-489.
4. Dursun N (1999): Veteriner Anatomi II, 5. Baskı, Medisan Yayınevi, Ankara.
5. De Schaepdrijver L, Simoens P, Lauwers H, Geest JPD (1989): Retinal vascular patterns in domestic animals. Res Vet Sci,47,34-42.
6. Freeman DE, Donawic WJ (1980): Occlusion of internal carotid artery in the horse by means of balloon-tipped catheter: clinical use of a method to prevent epistaxis caused by guttural pouch mycosis. JAVMA, 176,236-240.
7. Freeman DE, Donawic WJ, Klein LV (1994): Effect of ligation on internal carotid artery blood pressure in horses. Vet Surg, 23, 250-256.
8. Freman DE, Staller GS, Maxson AD, Sweeney CR (1993): Unusual internal carotid artery branching that prevented arterial occlusion with a balloon-tipped catheter in a horse. Vet Surg, 22, 531-534.
9. Getty R (1975): The Anatomy of the Domestic Animals. Vol. 2, Fifth Ed. WB Saunders Company, Toronto.
10. Nickel R, Schummer A, Seiferle E, Böhme G (1992): Lehrbuch der Anatomic der Haustiere. Band IV, Verlag P.Parey, Berlin.
11. Nomina Anatomica Veterinaria (1994): "Published by the International Committees on Veterinary Gross Anatomical Nomenclature. Fourth Ed, New York.
12. Sack WO (1994): Rooney's Guide to the Dissection of the Horse. Sixth Ed, Veterinary Textbook, New York.
13. Simoens P, Muylle S, Lauwers H (1996): Anatomy of the ocular arteries in the horse. Equine Vet J, 28,360-367.
14. MacDonald DG, Fretz PB, Baptiste KE, Hamilton DL (1999): Anatomic, radiographic and physiologic comparisons of the internal carotid and maxillary artery in the horse, Vet J, 158, 182-189.