External features of rat

1. External features of rat

5. Urogenital system of male and female rat

6. Urogenital system of female

7. Urogenital system of male

8. Arterial system of rat

9. Heart and Arterial System • In the centre of the thorax, locate the heart, within its coelomic cavity, the pericardial sac. Study the heart in position to see its major features. The apex of the heart is formed by the large, muscular, left ventricle. The right ventricle is not clearly distinguished externally from the left, but is smaller and has thinner walls. • Thepulmonary trunk (artery) carrying blood to the lungs, leads anteriorly from the right ventricle. The trunk crosses under and passes behind the aorta, which arises from the large left ventricle. The aorta passes forward then loops to the left and back.

10. Cont.. • The left and right atria lie anterior to the ventricles. They can be seen on either side of the pulmonary trunk and aorta. Find the two superior venae cavae which drain the anterior body regions, and the inferior vena cavawhich returns blood to the heart from the abdominal region, all of these enter the right atrium. • Pulmonary veins from the lungs enter the left atrium. Make a sketch of the heart and label the chambers and major vessels.

11. Trace the Systemic Veins

12. Trace The Branches of the Abdominal Aorta

14. Thank you