Venous System

Venous system

The body (cells, tissues and organs) returned deoxygenated blood into vein. All veins carry deoxygenated blood except pulmonary vein. Superior venacava, inferior venacava and coronary sinus are three main veins. These veins draw the deoxygenated blood into right atrium
 

Vein has tube like structure. 

The wall of vein is consists with three membrane

Tunica adventitia – Outer fibrous membrane
Tunica media – Middle muscle membrane
Tunica intima – Inner serous membrane

Veins are three types

1. Coronary sinus
2. Superior venacava
3. Inferior venacava

Branches of veins	Regions drained
Coronary sinus	All tissue of heart
Superior vena cava i)        Brachiocephalic veins ·         Internal jugular veins ·         Subclavian veins ii)      Axillary veins iii)    Cephalic veins	Head, neck, upper limbs and thorax. Brain, bone of cranium, muscles and tissues of neck and face Scalp and skin of head, face and neck Bones of arm and shoulder Muscles of upper limbs
Inferior vena cava i)        Hepatic veins ·         Left gastric vein ·         Right gastric vein ·         Splenic vein ·         Superior mesenteric vein ii)      Lumber veins iii)    Suprarenal veins iv)    Renal veins v)      Gonadal veins ·         Testicular veins ·         Ovarian veins	Abdomen, pelvis and lower limbs. End of esophagus, stomach, liver, gallbladder Abdominal portion of esophagus, stomach, and duodenum Spleen, fundus, descending colon, sigmoid colon and rectum Duodenum, jejunum, ileum and appendix Vertebral column Adrenal glands Kidneys Testes, epididymis, ureters   Ovaries