Thoracic Wall Components Identification

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Which spinal nerves innervate the diaphragm?

L1, L2, L3

T1, T2, T3

C3, C4, C5 (correct)

C1, C2, C3

What is the primary function of the diaphragm during quiet/resting breathing?

To compress the thoracic cavity during expiration

To maintain the position of the heart and lungs

To expand the thoracic cavity during inspiration (correct)

To regulate the flow of air in and out of the lungs

Which of the following describe the movement of the thoracic wall during inspiration?

Bucket-handle movement only

Pump-handle movement only

Both bucket-handle and pump-handle movements (correct)

Neither bucket-handle nor pump-handle movements

Which of the following is true about the range of motion of the thoracic wall during respiration?

The inferior regions have larger movements than the superior regions Signup and view all the answers

Which joints allow for the bucket-handle and pump-handle movements of the ribs during respiration?

Costotransverse/vertebral joints Signup and view all the answers

What is the clinical significance of the phrenic nerves innervating the diaphragm?

It keeps the diaphragm alive and functioning Signup and view all the answers

Which nerve innervates the diaphragm?

Phrenic nerve Signup and view all the answers

Which muscle is the primary muscle of respiration?

Diaphragm Signup and view all the answers

What is the function of the external intercostal muscles?

Elevate the ribs during inhalation Signup and view all the answers

Which nerve innervates the external intercostal muscles?

Intercostal nerves Signup and view all the answers

What is the function of the internal intercostal muscles?

Depress the ribs during exhalation Signup and view all the answers

Which muscle is responsible for forced exhalation?

Abdominal muscles Signup and view all the answers

Which of the following muscles elevates the ribs during forceful inspiration?

External intercostal muscles Signup and view all the answers

What is the primary function of the internal intercostal muscles?

Depress the ribs for expiration Signup and view all the answers

Which of the following structures innervates the muscles of the thoracic wall?

Intercostal nerves Signup and view all the answers

What is the primary function of the transversus thoracis muscle?

Depress the ribs for expiration Signup and view all the answers

Which of the following muscles is considered the innermost layer of the intercostal muscles?

Innermost intercostal muscles Signup and view all the answers

What is the primary function of the diaphragm muscle?

Facilitate inspiration by increasing thoracic volume Signup and view all the answers