Anatomy: Heart and Left Ventricle Wall Essay

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Nigel Cathéy
Advanced Anatomy
Mrs. Chandler
Block 5
Sheep heart lab report

I. Introduction- A sheep heart is really similar to a human heart. One thing that differentiates between a human heart and a sheep heart would be it's size. Most of the functions between the sheep heart and the human heart are the same though. The heart is protected by the ribs, and the sternum. The sheep heart also has 4 chambers. The upper chambers (2) pump the blood from veins toward the lower chambers. In this lab we dissected a sheep's heart and adventured it's internal and external perimeters so we could grasp a central idea on how the heart is structured as well as to be able to locate and be able to identify different parts of the sheep heart.

II. Hypothesis-
If we followed the instructions and dissected the sheep heart as instructed, then we would be able to locate and identify the internal and external structures.

III. Materials-
Sheep's heart
Dissecting tray
Blunt metal probe
A scalpel
A pair of scissors
Safety equipment insisted of: safety goggles lab aprons and gloves.

IV. Procedures-
External anatomy:
Obtain a dissecting tray and a set of dissecting instruments
Place the preserved sheep heart on your dissecting tray
Study Figure 1 and Figure 2 and familiarize yourself of the structures of the mammalian heart.
Notice that fat that covers the upper part of the heart and blood vessels. Remove as much as possible, so that the heart can be clearly observed and dissected. Use forceps to remove the fat either by picking it away of scraping with the edge of the forceps. Work carefully and do not damage any of the heart structures as you remove the fat.
The fat is light-colored, soft, mad without structure. Heart muscle is dark and fibrous. The walls of blood vessels are thin, tough, and usually smooth on the inside. Make an effort to distinguish between these three tissue types.
Once the fat is removed, locate the structures shown in Figure 1 and Figure 2. In some cases, the blood vessels may be cut off so close to the heart that little more than holes seem to show where they are once attached to the heart.
Internal anatomy:
Position the heart as shown in Figure 1 (anterior side up). Cut open the left atrium and locate the bicuspid valve between the left atrium and ventricle
Beginning at the point below the middle of the left ventricle, make am incision though the left ventricle wall as shown in Figure 2. Remove the lower, front portion of the wall.
Look through the hole you have produced and locate the chordae tendineae and the papillary muscles shown in Figure 3.
Trim away the front and side of the left ventricle wall, leaving part of the papillary muscles and all of
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