Serratus posterior inferior muscle

The Serratus posterior inferior muscle is a muscle of the human body. The muscle lies at the junction of the thoracic and lumbar regions. It arises from the vertebrae T11 through L3 and runs superolaterally to attach to the lower border of the 9th through 12th ribs.

It is situated at the junction of the thoracic and lumbar regions: it is of an irregularly quadrilateral form, broader than the serratus posterior superior muscle, and separated from it by a wide interval.

It arises by a thin aponeurosis from the spinous processes of the lower two thoracic and upper two or three lumbar vertebræ, and from the supraspinal ligament.

Passing obliquely upward and lateralward, it becomes fleshy, and divides into four flat digitations, which are inserted into the inferior borders of the lower four ribs, a little beyond their angles.

The thin aponeurosis of origin is intimately blended with the lumbodorsal fascia, and aponeurosis of the Latissimus dorsi.

Serratus Posterior Inferior draws the lower ribs backward and downward to assist in rotation and extension of the trunk. That it also aids in respiration is stated below according to Gray's Anatomy.