Biology 102

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• Biology 102
• Laboratory 2
• Human Heart AnatomySteer Heart
• Cardiac Muscle Histology

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Objectives for todays lab

• Lab Exam Objectives After completion of this
  lab, you should be able to
• Identify the anatomical structures of the human
  heart listed below using heart models, or
  photographs of models or hearts. (American Heart
  Model is best)
• Identify the anatomical structures of the steer
  heart listed below using heart models, or
  photographs of models or hearts.

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Heart Anterior View
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Heart Posterior View
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Heart Coronal Section
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Chambers of Heart/Blood Flow
Figure from Martini, Anatomy Physiology,
Prentice Hall, 2001
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Coverings of Heart
Figure from Martini, Anatomy Physiology,
Prentice Hall, 2001
Fibrous pericardium pericardial sac (outermost
layer)
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Wall of Heart
Figure from Holes Human AP, 12th edition, 2010

• Three layers
• endocardium
• forms protective inner lining
• membrane of epithelial and connective tissues
• myocardium
• cardiac muscle
• contracts to pump blood
• epicardium
• serous membrane (visceral pericardium)
• protective covering
• contains capillaries and nerve fibers

Know all the layers depicted in the diagram, and
know their correct order.
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Heart Valves
Pulmonary and Aortic Valve
Tricuspid Valve
Figures from Holes Human AP, 12th edition, 2010
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Blood Supply to Heart (Coronary circulation)
Anastamoses connections between 2 or more
branches of arteries that supply the same region
with blood. Give rise to collateral circulation
(LAD)
Blood flow through coronary arteries takes place
mainly during relaxation of the ventricles
(ventricular diastole)
Figure from Martini, Anatomy Physiology,
Prentice Hall, 2001
11
Blood Supply to Heart
Cardiac veins join at an enlargement called the
coronary sinus that drains into the right atrium
Figure from Martini, Anatomy Physiology,
Prentice Hall, 2001
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Brachiocephalic artery
Aorta
Superior vena cava
Pulmonary trunk
Right atrium
Left atrium
Right ventricle
Left ventricle
Apex of the heart
From Marieb and Mitchell , 10th edition, Pearson
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Aortic semilunar valve
Aorta
Right atrium
Left atrium
Tricuspid valve
Bicuspid valve
Myocardium
Chordae tendineae
Right ventricle
Trabeculae carneae
Interventricular septum
Left ventricle
From Marieb and Mitchell , 10th edition, Pearson
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Aorta
Left atrium
Aortic semilunar valve
Bicuspid valve
Tricuspid valve
Chordae tendineae
Right ventricle
Left ventricle
Interventricular septum
Papillary muscles
From Marieb and Mitchell , 10th edition, Pearson
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Calf Heart
From http//www.nietvergeten.com/jeroen_advocaat/
englisch/medical_illustration.htm20
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Things you should do in lab today

• Identify the structures listed on your Laboratory
  Guide
• Human heart models (I suggest you become familiar
  with the human heart before beginning dissection)
• Steer heart

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Next Lab

• Blood Vessel Anatomy
• See Exercise 32 in Mariebs Lab Manual
• Be sure to review what you did today and complete
  Review Sheet for Exercise 30 in your lab manual.
• You will be combining blood flow in the heart
  with what youre learning about blood vessels.