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

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

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

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

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.

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?

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

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.

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

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

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

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

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.

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

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.

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

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

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

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

END