Musculus Serratus Posterior (Noun)
Meaning
Skeletal muscle that draws the rib cage backward and downward.
Classification
Nouns denoting body parts.
Examples
- The musculus serratus posterior is a deeply situated muscle that originates from the spinous processes of the lower part of the thoracic and the supraspinous ligaments of the upper lumbar vertebrae.
- During forced expiration, the musculus serratus posterior contracts to help drag the rib cage posteriorly and inferiorly.
- In quadruped mammals, the musculus serratus posterior is well-developed and plays a vital role in the movement of the thoracic cage during locomotion.
- The musculus serratus posterior works in conjunction with the latissimus dorsi to depress the thoracic cage, thus increasing intrathoracic pressure.
- Electromyographic studies have shown that the musculus serratus posterior is active during forced expiration in humans, especially when heavy weights are lifted.