Questions and Answers
What is the primary action of the external intercostals?
Which nerve is responsible for innervating the diaphragm?
Which muscles are involved in depressing the ribs during exhalation?
What spinal segments innervate the internal intercostals?
Signup and view all the answers
What is the main function of the diaphragm during respiration?
Signup and view all the answers
Which of the following muscles primarily contribute to increasing the thoracic volume during inhalation?
Signup and view all the answers
What is the primary function of the internal intercostals during respiration?
Signup and view all the answers
Which nerve is associated with the function of the diaphragm?
Signup and view all the answers
Which is true regarding the muscles of the thoracic cage?
Signup and view all the answers
What action do the external intercostals perform?
Signup and view all the answers
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
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!
