| Rabbit-Venous system | Frog-Venous system |
| 1. Coronary veins collecting the blood from the wall of heart open \n\o left precaval vein. | 1. Coronary vein collecting blood from the wall of heart opens into anterior abdominal vein. |
| 2. The blood from different organs of the body is collected by two superior vena cavae and a posterior vena cava which open separately into the right auricle. | 2. The blood from different organs of the body is collected by two precavals and one post caval which unite together to form a sinus venosus that inturn opens into right auricle. |
| 3. Each precaval or superior vena cava is formed by three veins namely i. External Jugular ii. Internal jugular and iii. sub-clavian | 3. Each precaval vein is formed by three veins viz.i. External jugular ii. Innominate and iii. sub-clavian. |
| 4. External jugular brings blood from tongue, jaws and muscles of the head and is connected with that of the opposite side by a jugular anastomosis | 4. External jugular brings the blood from tongue and muscles of jaw by lingual and mandibular. |
| 5. Internal jugular receives internal carotid that receives blood from brain and neck and opens into external jugular vein. | 5. Innominate is formed by internal jugular bringing blood from brain and orbit and a sub - scapular from shoulder and back of the arm. |
| 6. The sub-clavian brings blood from shoulders and fore-limbs. | 6. The sub-clavian collects blood from forelimbs by brachial vein and from skin and muscles of the abdomen by Musculo-cutaneous vein. |
| 7. Anterior intercostal veins collect blood from intercostal spaces and open into pre - cavals. | 7. Anterior intecostal veins are absent. |
| 8. The inferior vena cava is formed by union of several veins. | 8. The post caval vein is formed by union of four pairs of renal veins collecting from kidneys. |
| 9. The internal iliacs bring blood from the back of thigh. The external iliac is formed by a femoral vein from the inner part of thigh and a posterior epigastric from ventral wall of abdomen. Vesicular vein brings blood from urinary bladder into internal iliac. | 9. Sciatic brings blood from interior of thigh while the femoral brings blood from outer part of the thigh. Vesicular vein from the urinary bladder opens into anterior abdominal vein. |
| 10. Caudal vein collects blood from the tail | 10. Caudal vein is absent. |
| 11. Ilio-lumbar from abdomen and gonadial from gonads pour blood into the post caval vein. | 11. A dorso lumbar from dorsal body wall pours into renal portal vein while first renal vein also collects from gonad by a gonadial vein. |
| 12. Renal portal system is absent. | 12. Renal portal system is well developed. |
| 13. Hepatic portal system is constituted by Hepatic portal vein from different parts of the alimentary canal. | 13. Hepatic portal system is constituted by Hepatic portal vein from different parts of alimentary canal and an Anterior abdominal vein from posterior parts of the body. |
| 14. Phrenic veins bring the blood from diaphragm into post caval vein. | 14. Phrenic veins are absent. |
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