Podcast
Questions and Answers
What is the primary action of the external intercostals?
What is the primary action of the external intercostals?
Which nerve is responsible for innervating the diaphragm?
Which nerve is responsible for innervating the diaphragm?
Which muscles are involved in depressing the ribs during exhalation?
Which muscles are involved in depressing the ribs during exhalation?
What spinal segments innervate the internal intercostals?
What spinal segments innervate the internal intercostals?
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What is the main function of the diaphragm during respiration?
What is the main function of the diaphragm during respiration?
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Which of the following muscles primarily contribute to increasing the thoracic volume during inhalation?
Which of the following muscles primarily contribute to increasing the thoracic volume during inhalation?
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What is the primary function of the internal intercostals during respiration?
What is the primary function of the internal intercostals during respiration?
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Which nerve is associated with the function of the diaphragm?
Which nerve is associated with the function of the diaphragm?
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Which is true regarding the muscles of the thoracic cage?
Which is true regarding the muscles of the thoracic cage?
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What action do the external intercostals perform?
What action do the external intercostals perform?
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Study Notes
Thoracic Cage Muscles Structure
- External intercostals are located between the ribs and are innervated by intercostal nerves T1-T11.
- Internal intercostals lie beneath the external intercostals and are also innervated by intercostal nerves T1-T11.
- The diaphragm is a dome-shaped muscle responsible for breathing, innervated by the phrenic nerve, which originates from the cervical spinal nerves C3, C4, and C5.
Actions of Thoracic Cage Muscles
- External intercostals facilitate inhalation by lifting the ribs, expanding the thoracic cavity to allow air intake.
- Internal intercostals assist in exhalation by depressing the ribs, promoting airflow out of the lungs.
- The diaphragm is the primary muscle for inhalation, contracting to increase the thoracic volume during breathing.
Thoracic Cage Muscles Structure
- External intercostals are located between the ribs and are responsible for inhalation.
- Innervated by intercostal nerves T1-T11, which provide motor control.
- Internal intercostals lie beneath the external intercostals and assist with exhalation.
- Also innervated by intercostal nerves T1-T11, allowing for coordinated muscle action.
- The diaphragm is a dome-shaped muscle crucial for breathing, positioned beneath the rib cage.
- Innervated by the phrenic nerve, originating from cervical spinal nerves C3, C4, and C5.
Actions of Thoracic Cage Muscles
- External intercostals lift the ribs during inhalation, expanding thoracic cavity volume for air intake.
- Internal intercostals depress the ribs during exhalation, facilitating airflow out of the lungs.
- The diaphragm contracts to increase thoracic volume, making it the primary muscle for inhalation.
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Description
This quiz focuses on the structure and function of thoracic cage muscles, including the external intercostals, internal intercostals, and diaphragm. It covers their actions during inhalation and exhalation, as well as the relevant intercostal nerves and the phrenic nerve. Test your knowledge on these essential respiratory muscles!
