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Questions and Answers
What are the two subdivisions of the dorsal body cavity?
What are the two subdivisions of the dorsal body cavity?
- Pleural cavities and mediastinum
- Cranial cavity and spinal cavity
- Thoracic cavity and abdominal cavity
- Cranial cavity and vertebral canal (correct)
Which of the following organs is housed within the thoracic cavity?
Which of the following organs is housed within the thoracic cavity?
- Heart (correct)
- Liver
- Rectum
- Bladder
What is the primary function of the membranes called meninges?
What is the primary function of the membranes called meninges?
- Protect the lungs
- Cover the brain and spinal cord (correct)
- Enclose the heart
- Separate abdominal organs
Which of the following pairs correctly describes the subdivisions of the ventral body cavity?
Which of the following pairs correctly describes the subdivisions of the ventral body cavity?
What does the abdominal cavity primarily contain?
What does the abdominal cavity primarily contain?
What is the name of the cavity that surrounds the lungs?
What is the name of the cavity that surrounds the lungs?
Where are the serous membranes located in the body?
Where are the serous membranes located in the body?
What structure separates the thoracic cavity from the abdominopelvic cavity?
What structure separates the thoracic cavity from the abdominopelvic cavity?
What is the layer that lines the walls of the cavities called?
What is the layer that lines the walls of the cavities called?
What does the visceral serous membrane cover?
What does the visceral serous membrane cover?
In the analogy of a fist pushing into a balloon, what does the fist represent?
In the analogy of a fist pushing into a balloon, what does the fist represent?
What separates the visceral and parietal serous membranes in the body?
What separates the visceral and parietal serous membranes in the body?
Which serous membrane is in contact with the lungs?
Which serous membrane is in contact with the lungs?
What is one of the primary functions of serous fluid between the membranes?
What is one of the primary functions of serous fluid between the membranes?
How are serous membranes named?
How are serous membranes named?
Which statement is true regarding the relationship between the visceral and parietal serous membranes?
Which statement is true regarding the relationship between the visceral and parietal serous membranes?
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Study Notes
Dorsal Body Cavity
- Encloses the brain and spinal cord, comprising the cranial cavity and vertebral canal.
- Cranial cavity houses the brain, while the vertebral canal houses the spinal cord.
- Both structures are protected by membranes known as meninges.
Ventral Body Cavity
- Houses most internal organs, collectively termed the viscera.
- Divided into two main subdivisions: the thoracic cavity and the abdominopelvic cavity.
Thoracic Cavity
- Located superior to the abdominopelvic cavity.
- Primarily contains the heart and lungs.
- Subdivided into:
- Two lateral pleural cavities for each lung, surrounded by ribs.
- A medial mediastinum that contains the heart, major blood vessels, thymus, trachea, and esophagus.
Abdominopelvic Cavity
- Enclosed by abdominal muscles, comprising the abdominal cavity and pelvic cavity.
- The peritoneal cavity houses the organs of this cavity.
- Abdominal cavity includes major digestive organs: stomach, intestines, liver, and spleen.
- Pelvic cavity contains the urinary bladder, urethra, rectum, and reproductive organs.
Serous Membranes of the Ventral Body Cavity
- Comprise double layers: parietal serous membrane lining cavity walls and visceral serous membrane covering internal organs.
- Relationship illustrated through analogy of a fist (organ) in a deflated balloon (membranes).
- No air exists between the layers; separated by serous fluid, reducing friction as organs move.
Thoracic Cavity Membranes
- Named based on proximity to specific organs:
- Pericardial cavity surrounds the heart and is lined by pericardial membranes.
- Pleurae membranes line the thoracic cavity and cover the lungs:
- Visceral pleura is in contact with lungs.
- Parietal pleura lines the wall of the lung cavity.
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