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LABORATORY TEN
The Circulatory System: Anatomy
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Sheep Heart Dissection
• Identify the assigned superficial structures on p174, #3.
• Make a coronal section– Place the heart upside down, apex on the top – Find the posterior interventricular suclus and
keep it in the middle– With a scalpel cut around the apex, towards
the auricles, try not to saw– Identify the assigned structures on p175, #4
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The Human Heart
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Major Arteries Major Veins
Use right arm and left leg to study the arteries and veins of systemic circuit in limbs; except for great saphenous vein (look on the right leg)
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Coronary Circulation(supplies the heart muscle)
Coronary sinus: look for a big blue vein at the posterior side
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Circle of Willis(circulation to the brain)
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Hepatic Portal Circulation(shunts blood from digestive organs to the liver for final
metabolism and detoxification and from liver to the inferior vena cava for return to the heart)
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Fetal Circulation(designed to by-pass fetal lung)
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Lymphatic System(related to body defense mechanisms)
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Demonstration Stations
• Fig 10.11 & 10.12, p175 & 176: model & microscope slide of cardiac muscle cells
• Fig 10.13, p176: microscope slide of blood vessels– Arteries have thicker wall– Veins have collapsed wall