Which muscle elevates the ribs and assists with respiration?

Which muscle elevates the ribs and assists with respiration?

• A. Diaphragm
• B. Serratus posterior superior
• C. External intercostals
• D. Levatores costarum

Answer: (D)

Rib elevation during quiet and active breathing is achieved by muscles that pull the rib cage upward to expand thoracic volume. Levatores costarum are small, deep back muscles that originate from the transverse processes of the vertebrae and insert on the rib below. When they contract, they pull the adjacent rib upward, increasing the height and transverse diameter of the thorax and aiding inspiration. This targeted action on lifting the ribs makes them a classic example of a muscle that elevates the ribs to assist respiration, especially in deeper or labored breaths. While the diaphragm is the primary inspiratory muscle and external intercostals also elevate ribs, levatores costarum specifically provide the rib-elevation mechanism described here.

Rib elevation during quiet and active breathing is achieved by muscles that pull the rib cage upward to expand thoracic volume. Levatores costarum are small, deep back muscles that originate from the transverse processes of the vertebrae and insert on the rib below. When they contract, they pull the adjacent rib upward, increasing the height and transverse diameter of the thorax and aiding inspiration. This targeted action on lifting the ribs makes them a classic example of a muscle that elevates the ribs to assist respiration, especially in deeper or labored breaths. While the diaphragm is the primary inspiratory muscle and external intercostals also elevate ribs, levatores costarum specifically provide the rib-elevation mechanism described here.