1. Dissect, display and Identify the parts of a Sheep’s Heart
Materials and Procedure

2. Make your Flag Labels
1. Pulmonary Artery 8. Septum 2. Pulmonary vein 9. Aorta 3. Bicuspid valve 10. Vena cava 4. Semi-lunar valve 11. Right ventricle 5. Right atrium 12. Left ventricle 6. Tricuspid valve 13. Left atrium 7. Coronary artery 14. Chordae tendinae

3. Before you start make a copy of this Table of observations
Chamber
Size: small/large
Wall: thin/thick
Left atrium
Right atrium
Left ventricle
Right ventricle
Valve
Shape/Number of Flaps
Bicuspid
Tricuspid
Semi-lunar

4. Gather Equipment! Needed: Dissection board Scalpel and blade
Forceps (tweezers)
Scissors
Gloves
Flag Pins
Dropper

5. Step 1
Identify the front of the heart by locating the position of the coronary artery. Place this side facing up on the dissecting board.

6. Step 2 Which will have a thicker wall?
Feel / pinch the left and right side of the heart to distinguish between them.
Which will have a thicker wall?

7. Step 3
Identify the blood vessels: aorta, pulmonary artery, vena cava and pulmonary vein.

8. Make a shallow cut in the left ventricle and the left atrium.
Step 4
Make a shallow cut in the left ventricle and the left atrium.

9. Push open the chambers and examine the internal structure.
Step 5
Push open the chambers and examine the internal structure.

10. Step 6
Locate the bicuspid valve and note the chordae tendinae – anchoring the cusps of the valve

11. Repeat the previous steps for the right side of the heart.

12. Step 8
Locate the tricuspid valve and note the chordae tendinae anchoring the cusps.

13. Observe
*Note the difference between the walls of the left ventricle and the right ventricle.
*Locate the septum separating the left from the right side of the heart.

14. Insert a forceps under the moderator band in the right ventricle
Step 9
Insert a forceps under the moderator band in the right ventricle

15. Identify dorsal aorta. Cut open. Find the semi-lunar valves.
Step 10
Semi Lunar Valves
Identify dorsal aorta. Cut open. Find the semi-lunar valves.

16. Step 11
Identify the opening at the base of the aorta, above the semi-lunar valves, leading to the coronary arteries

17. To highlight the coronary arteries
*Using a dropper, pump air into the opening at the base of the aorta.

18. Flag label each of the structures that you have identified.
Step 11
Septum
Flag label each of the structures that you have identified.

19. Fill in your Observations
Chamber
Size: small/large
Wall: thin/thick
Left atrium
Right atrium
Left ventricle
Right ventricle
Valve
Shape/Number of Flaps
Bicuspid
Tricuspid
Semi-lunar

20. END