İbrahim KÜRTÜL, KADİR ASLAN, Sami ÖZCAN, GÜRSOY AKSOY

Formation of cerebral arterial circle (Circulus arteriosus cerebri) in the fetus of zavot-bred cattle

Memelilerde beyin, pek çok damarın ortaklaşa oluşturduğu bir çember, Willis Poligonu, tarafından beslenmektedir. Bu çalışma Kars ve çevresinde yetiştirilen Zavot ırkı sığır fetuslarında çemberin oluşumunu ortaya çıkarmayı amaçlamaktadır. Çalışmada cinsiyet farkı gözetmeksizin 2-7 aylık 15 adet fetus kullanıldı. Materyallere a. carotis dextra ve sinistra yolu ile renklendirilmiş latex verildi ve takiben diseksiyon uygulaması ile çember gözlemlendi. Çemberin yanlardan a. carotis interna dextra et sinistra, arkadan a. basilaris, ve ön taraftan a. ethmoidalis interna ve a. ophthalmica interna tarafından oluşturulduğu belirlendi. Çalışmada bu damarların başlangıçları ve seyirleri de incelendi. Sağ ve sol a. vertebralis'in dallanma göstermeden a. basilaris'i direkt olarak oluşturduğu gözlendi.

Anahtar Kelimeler:

atardamarlar, kan dolaşımı, kan damarları, kalp damar sistemi, sığır, dölüt

Zavot ırkı sığır fetuslarında willis poligonu' nun formasyonu

Nourishment of the brain in mammals is provided by the circle of Willis (circulus arteriosus cerebri), a unique structure made up by several arteries. This study aimed at revealing the construction of this circle in the fetuses of the Zavot cattle raised in Kars and its province. Fifteen fetuses, regardless of their sex, at the age of 2-7 months were used in the study. Methodically, colored-latex was injected by way of both the right and left common carotid arteries, followed by dissection. Arteries joining the formation of the circle of Willis were observed as follow; the right and left internal carotid arteries (a. carotis interna dextra et sinistra) laterally, the termination of the basilar artery (a. basilaris) caudally, and the internal ethmoidal (a. ethmoidalis interna) and internal ophthalmic (a. ophthalmica interna) arteries cranially. Patterns and origins of these arteries were also determined in the present study. The right and left vertebral arteries united directly to form the basilar artery without dividing into the cranial and caudal rami.

Keywords:

arteries, blood circulation, blood vessels, cardiovascular system, cattle, fetus,

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