VENOUS SYSTEM OF FROG (AMPHIBIAN) AND RABBIT (MAMMAL) - SIMILARITIES AND DIFFERENCES
|Rabbit - Venous system
||Frog - Venous system
|1. Coronary veins collecting the blood from the wall of heart open into 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 forelimbs.
||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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