Circulatory system includes cardiovascular system and lymphatic vascular system. The cardiovascular system includes heart, arteries, capillaries and veins. There are three layers in the wall of the vascular: tunica intima, tunica media and tunica adventitia.

Fig 1 Medium-sized artery and vien(HE stain,low mag.) medium-sized vien medium-sized artery

Fig 2 Medium-sized artery Tunica media Internal elastic membrane external elastic membrane endotheliun adventitia

Tunica adventitia Fig 3 medium-sized vien(HE stain,high mag.) Tunica intima Tunica media

Valve of vien Fig 4 vein(HE stain,high mag.),showing valve of vein

Fig 5 Large artery(HE stain,low mag.) lumen Tunica intima Tunica media

Fig 6 Large artery(HE stain,high mag.) Tunica adventitia Tunica intima

Elastic membrane in tunica media of large artery Fig 7 Large artery(special stain,high mag.)

Tunica media Fig 8 Large vein (HE stain,low mag.) Tunica adventiti a A bundle of smooth muscle

Tunica media Fig 9 Large vein (HE stain,high mag.) Tunica adventitia Tunica intima

A bundle of smooth muscle in tunica adventitia of large artery Fig 10 The adventitia of large vein (HE stain,high mag.)

Fig 11 Small artery and small vein (HE stain, high mag.) Small vein Small artery

capillarie s Fig 12 Section of connective tissue arteriole venule

The wall of heart is organized in three layers: endocardiun, myocardium and epicardium. Endocardiun includes endothelium, subendothelial layer and subendocardial layer.

endocardium Fig 13 Ventricle wall (HE stain,high mag.) Purkinje fiber myocardium

Fig14 Epicardium of ventricle wall mesothelium

Lymphatic vascular system includes lymphatic capillaries, lymphatic vessels and lymphatic ducts.

Fig 13 lymphatic vessel lymphatic valve