Which muscle group does the serratus posterior inferior belong to?

The serratus posterior inferior is classified as part of the deep back muscles. These muscles are located beneath the superficial layers of the back muscles and are primarily involved in the stabilization and movement of the vertebral column. Specifically, the serratus posterior inferior plays a role in the movement of the ribs during forced expiration, contributing to respiratory function, but its anatomical classification places it within the deep back muscle group due to its position and connection to the spine.

While it does play a role in the respiratory process, its primary classification isn't as respiratory muscles or others like core muscles or superficial back muscles. Understanding the function and location of the serratus posterior inferior is essential in sports massage therapy, especially when working with clients to improve their posture and respiratory mechanics.