The serratus posterior inferior is primarily located in which region of the body?

The serratus posterior inferior is primarily located in the posterior abdominal wall. It is a muscle that originates from the spinous processes of the lower thoracic and upper lumbar vertebrae, specifically T11 to L2, and inserts into the lower ribs (ribs 9 to 12). Its primary function is to assist with the movement of the ribs during respiration, particularly during forced exhalation.

This muscle plays an important role in stabilizing and supporting the lower ribs during movement and affects the position of the thorax and abdomen. Being situated in the posterior abdominal wall connects it to other muscles in that region, allowing for coordinated movements of the trunk and upper limbs. This anatomical placement helps to clarify its function and significance in sports massage and anatomy.