Arterial System of Frog. Hi, I, Abhay Kumar Mishra, am a Lecturer in Zoology in Birgunj, Nepal. Each branch divides into three aortic arches- an anterior carotid arch, a middle systemic arch and a posterior pulmocutaneous arch. The blood vessels which carry the blood from heart to different parts of the body are called arteries. It is divided into two main branches each of which further divides to form three small branches. Carotid Arch Carotid Arch: Caval Veins: The deoxygenated […] In frog arterial system begins with the truncus arteriosus which divides into two large right and left branches or trunks. Detailed Structure of Frog’s Heart. The system consisting of arteries is called arterial system. Venous System of Frog (Visited 10,612 times) Tags: Anterior venacava, External Jugular vein, Innominate vein, Portal venous system, Posterior venacava, Pulmonary venous system, Subclavian vein, Systemic venous system, Venous System of Frog. Post navigation. ADVERTISEMENTS: The blood vessels which carry the blood towards the heart constitute the venous system. It starts from truncus arteriosus. The venous system in frog constitutes the following main veins: Pulmonary Veins: The oxygenated blood from two lungs is returned by two pulmonary veins, which open dorsally into the left auricle after uniting with each other.