Serratus posterior inferior muscle

The serratus posterior inferior muscle, also known as the posterior serratus muscle,^{[citation needed]} is a muscle of the human body.

Structure

The muscle is situated at the junction of the thoracic and lumbar regions.^[1] It has an irregularly quadrilateral form, broader than the serratus posterior superior muscle, and separated from it by a wide interval.

It arises by a thin

Passing obliquely upward and lateralward, it becomes fleshy, and divides into four flat digitations.[1] These are inserted into the inferior borders of the lower four ribs, a little beyond their angles.^[1]

The thin aponeurosis of origin is intimately blended with the thoracolumbar fascia, and aponeurosis of the latissimus dorsi muscle.^{[citation needed]}

Function

The serratus posterior inferior draws the lower ribs backward and downward to assist in rotation and extension of the

See also

• Serratus anterior muscle
• Serratus posterior superior muscle

References

This article incorporates text in the public domain from page 404 of the 20th edition of Gray's Anatomy (1918)

External links

Wikimedia Commons has media related to Serratus posterior inferior muscles.

• Anatomy figure: 01:05-04 at Human Anatomy Online, SUNY Downstate Medical Center - "Intermediate layer of the extrinsic muscles of the back, deep muscles."
• Cross section image: pembody/body8a—Plastination Laboratory at the Medical University of Vienna