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Serratus posterior inferior muscle

Muscle of the mid-low back

Summary

Muscle of the mid-low back

Field	Value
Name	Serratus posterior inferior muscle
Latin	musculus serratus posterior inferior
Image	Serratus posterior.PNG
Caption	Muscles connecting the upper extremity to the vertebral column (serratus posterior inferior labeled at center right).
Image2	Serratus posterior inferior muscle back3.png
Caption2	Serratus posterior inferior (red) seen from back.
Origin	Vertebrae: Spinous processes of T11 - L2
Insertion	The inferior borders of the 9th through 12th ribs
Action	Depress the lower ribs 9-12, aiding in expiration
Blood	Intercostal arteries
Nerve	Intercostal nerves T9 through T12

The serratus posterior inferior muscle, also known as the posterior serratus muscle, is a muscle of the human body.

Structure

The muscle is situated at the junction of the thoracic and lumbar regions. 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 aponeurosis from the spinous processes of the lower two thoracic and upper two or three lumbar vertebrae.

Passing obliquely upward and lateralward, it becomes fleshy, and divides into four flat digitations. These 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 thoracolumbar fascia, and aponeurosis of the latissimus dorsi muscle.

Function

The serratus posterior inferior draws the lower ribs backward and downward to assist in rotation and extension of the trunk. This movement of the ribs may also contribute to inhalation and forced expiration of air from the lungs.

Additional images

| File:Serratus posterior inferior muscle animation.gif|Position of the serratus posterior inferior (shown in red). Animation. | File:Serratus posterior inferior muscle animation2.gif|Close up. The muscle arises from the vertebrae T11 through L2 and inserted into lower border of the 9th through 12th ribs. | Image:LumbarTriangle.jpg|Lumbar triangle

References

(2006-01-01). "RESPIRATORY MUSCLES, CHEST WALL, DIAPHRAGM, AND OTHER". Academic Press.
(2011-01-01). "Chapter 10 - The lumbar spine". Churchill Livingstone.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

muscles-of-the-torso

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