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Questions and Answers
What is contained within the middle mediastinum?
What is contained within the middle mediastinum?
- Esophagus and trachea
- Abdominal organs
- Pericardium and heart (correct)
- Lungs and diaphragm
Which structures are associated with the middle mediastinum?
Which structures are associated with the middle mediastinum?
- Spleen and pancreas
- Abdominal aorta and inferior vena cava
- Cervical vertebrae and spinal cord
- Great vessels and smaller vessels (correct)
Which of the following best describes the location of the middle mediastinum?
Which of the following best describes the location of the middle mediastinum?
- Centrally located in the thoracic cavity (correct)
- Adjacent to the respiratory organs
- In the abdominal cavity
- On the left side of the thoracic cavity
Which of the following is NOT a component of the middle mediastinum?
Which of the following is NOT a component of the middle mediastinum?
What type of vessels can be found in the middle mediastinum?
What type of vessels can be found in the middle mediastinum?
What does the superior vena cava lack as it opens into the right atrium?
What does the superior vena cava lack as it opens into the right atrium?
How does the inferior vena cava differ from the superior vena cava?
How does the inferior vena cava differ from the superior vena cava?
Where does the inferior vena cava open in the heart?
Where does the inferior vena cava open in the heart?
Which statement about the valves of the vena cavae is correct?
Which statement about the valves of the vena cavae is correct?
What feature is unique to the superior vena cava when compared to the inferior vena cava?
What feature is unique to the superior vena cava when compared to the inferior vena cava?
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Study Notes
Middle Mediastinum
- Located in the thoracic cavity
- Contains pericardium, heart, origins of great vessels, nerves, and smaller vessels
Heart Chambers & Valves
- Right Atrium:
- Superior vena cava opens into the upper part, no valve
- Inferior vena cava opens into the lower part, guarded by a rudimentary, nonfunctioning valve
- Coronary sinus opens between the inferior vena cava and the atrioventricular orifice, guarded by a rudimentary, nonfunctioning valve
- Right Ventricle:
- Papillary muscles project inward, attached to ventricular wall
- Apices connected to tricuspid valve cusps by chordae tendineae
Aortic Valve
- No chordae or papillary muscles associated with cusps
- Three semilunar cusps: one posterior (left cusp), two anterior (anterior and right cusps)
Left Atrium
- Consists of a main cavity and a left auricle
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