Sheep heart observation lab answers

Anatomy And Physiology Labs 2, Lab 10

EXPERIMENT 6: SHEEP HEART DISSECTION Sheep hearts share structural and functional characteristics with human hearts. In this activity, you will explore the anatomy of the sheep heart to identify major heart features.

PROCEDURE 1. To begin, lay down your underpad and place your dissecting tray on top of it. Be sure you have all of your safety equipment

on before beginning.

2. Once prepared, gently open the bag your sheep heart is in.

3. Lay your sheep heart onto the dissecting tray.

4. Examine the anterior surface of the heart. Identify the following structures:

• Pericardium

• Epicardium

• Base

• Apex

• Right Auricle

• Left Auricle

• Right Ventricle

• Left Ventricle

• Pulmonary Trunk

5. Examine the posterior surface of the heart. Identify the following structures:

• Coronary Sulcus

• Left Auricle

• Left Ventricle

• Right Auricle

• Right Ventricle

6. Insert a blunt probe into the collapsed superior vena cava and into the right atrium. Find the opening for the inferior vena cava, and push the probe into this vessel.

7. Make a coronal cut in the sheep heart with a scalpel. Start at the apex and cut toward the base, slicing through both auricles, but not all the way through the base (do not completely separate the two halves).

Experiment 6Sheep Heart Dissection Materials Sheep Heart

Dissection Tool Kit

Dissection Tray

Experiment Inventory

https://vimeo.com/190319623
8. Identify the following internal structures:

• Myocardium

• Endocardium

• Right Atrium

• Right Auricle

• Pectinate Muscle

• Opening of the Superior and Inferior Vena Cava

• Tricuspid Valve

• Opening of the Coronary Sinus

• Right Ventricle

• Chordae Tendineae

• Papillary Muscles

• Pulmonary Semilunar Valve

9. Insert a blunt probe into the right atrium, and find the opening of the coronary sinus (this will be inferior to the opening of the inferior vena cava). Insert the probe into this region, and observe its movement.

10. While still in the right atrium, use the blunt probe to explore the pulmonary trunk, pushing the probe to the superior end of the vessel.

11. Remove the probe, and make a longitudinal incision across the pulmonary trunk with a scalpel. This will expose the pulmonary semilunar valve.

12. Identify the following structures on the left side of the heart:

• Left Atrium

• Left Auricle

• Bicuspid Valve

• Left Ventricle

• Aortic Semilunar Valve

• Aorta

13. Observe the heart valves and note if there are chordae tendineae or papillary muscles.

14. Identify the openings to the right and left coronary arteries, just anterior to the flaps of the aortic valve.

15. Take a photograph of our dissected sheep heart showing at least one atrioventricular valve for the upload document. Make sure your name and access code are handwritten on a piece of paper that is clearly visible in the background of the photograph.

16. Upon completing the sheep heart dissection, clean off your dissecting tray and dissecting tools with soap and water. Biological scraps should not be thrown into the garbage. Securely store the biological scraps until the end of the term so that they can be properly disposed of at one time.

17. Clean the area in which you worked with soap and water. As long as the underpad has not been damaged, keep it for future experiments.