Serratus Posterior Inferior is a small yet significant muscle located in the human body. It is part of the deeper layer of muscles located in the back, specifically in the lower region. This muscle is situated close to the spine, running vertically from the lower four vertebrae of the spine, known as T11 to L2, to the lower border of the lower ribcage, specifically ribs 9 to 12.
The name "Serratus Posterior Inferior" derives from its characteristics and location. "Serratus" refers to the serrated or saw-toothed appearance of its attachment to the ribs, while "Posterior Inferior" signifies its position in the posterior (back) part of the body, specifically lower in relation to other muscles.
The main function of the Serratus Posterior Inferior is to aid in the respiratory process by assisting with inhalation. When this muscle contracts, it pulls the lower ribs downward and outward, expanding the thoracic cavity and aiding the expansion of the lungs. This action allows for the intake of oxygen during breathing.
In addition to its respiratory function, the Serratus Posterior Inferior also plays a role in providing stability to the spine. It assists in movements of the trunk, especially bending and rotating the torso.
Overall, the Serratus Posterior Inferior muscle is an essential component of the musculoskeletal system, contributing to respiration and providing support to the back and trunk.
