ANATOMY OF THE CIRCULATORY SYSTEM OF RADIX AURICULARIA (LINNAEUS)

The circulatory system of the snail consists of four partsⅠ. Heart The heart consists of a ventricle and a auricle, between them there is a valve of two flaps to prevent backflow. The myocardium of the heart is composed of myonemae.Ⅱ. Arterial system The ventricle connects posteriorly with an arterial truck, the arteria communis, which immediately divides into two branches.1. The aorta anterior is a larger vessel which gets anteriorly, sending out great many of branches to supply the reproductive system, the digestive system, the locomotive organfoot, and the head and tentaces.2. The aorta posterior supplies the liver, the stomach and the gut with blood.Ⅲ. Venous system In this system, there are vena pulmonalis communis, a centra] venous circle, an anterior venous circle and their branches, as described in the Chinese text.Ⅳ. Blood The fresh blood of the snail is a bluish haemocyanin a containing three components.