Anatomy of the Sheep and Human Heart
Key Structures
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Apex and Base
- Apex: Bottom point of the heart
- Base: Top of the heart
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Auricles (Oracles)
- Pouches that fill up when atria fill up
- Left auricle and right auricle based on orientation
Heart Chambers
- Right Atrium
- Right Ventricle
- Left Atrium
- Left Ventricle
Valves
-
Atrioventricular Valves
- Tricuspid valve (right atrial ventricular valve)
- Bicuspid valve (left atrial ventricular valve, also known as the mitral valve)
-
Semilunar Valves
- Pulmonary valve (right semilunar valve)
- Aortic valve (left semilunar valve)
Supporting Structures
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Chordae Tendineae
- Tendinous cords attached to atrioventricular valves and papillary muscles
-
Papillary Muscles
- Muscles attached to chordae tendineae
Septum
- Interventricular Septum
- Interatrial Septum
Layers of Heart Wall
- Epicardium: Thin outer layer
- Myocardium: Thick middle layer
- Endocardium: Thin inner layer
Blood Flow Pathway
- Superior and inferior vena cava bring deoxygenated blood to the right atrium.
- Blood flows into the right ventricle through the tricuspid valve.
- Blood is pumped through the pulmonary valve into the pulmonary trunk.
- Pulmonary arteries carry blood to the lungs for oxygenation.
- Oxygenated blood returns via pulmonary veins to the left atrium.
- Blood flows into the left ventricle through the bicuspid valve.
- Blood is pumped through the aortic valve into the aorta.
Additional Structures
- Trabeculae: Plate-like structures within the muscle
- Pectinate Muscle: Found under the auricle
Human Heart Model
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Vessels
- Aorta (ascending, arch, descending)
- Pulmonary trunk
- Pulmonary arteries and veins
-
Orientation
- Superior vena cava: Brings blood to the heart
- Inferior vena cava: Brings blood to the heart
- Left and right pulmonary arteries and veins for blood exchange to and from lungs
This lecture covered the similarities and differences between the anatomy of a sheep heart and a human heart model, focusing on the main components and pathways of blood flow.