Serratus posterior inferior muscle
|Serratus posterior inferior muscle|
|Origin||Vertebrae: Spinous processes of T11 - L2|
|Insertion||The inferior borders of the 9th through 12th ribs|
|Nerve||Intercostal nerves T9 through T12|
|Actions||Depress the lower ribs 9-12, aiding in expiration|
|Latin||Musculus serratus posterior inferior|
|Anatomical terms of muscle|
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.
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 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.
Close up. The muscle arises from the vertebrae T11 through L2 and inserted into lower border of the 9th through 12th ribs.
- Jolley, C. J.; Moxham, J. (January 1, 2006), "RESPIRATORY MUSCLES, CHEST WALL, DIAPHRAGM, AND OTHER", in Laurent, Geoffrey J.; Shapiro, Steven D. (eds.), Encyclopedia of Respiratory Medicine, Oxford: Academic Press, pp. 632–643, ISBN 978-0-12-370879-3, retrieved January 17, 2021
- Chaitow, Leon; DeLany, Judith (January 1, 2011), Chaitow, Leon; DeLany, Judith (eds.), "Chapter 10 - The lumbar spine", Clinical Application of Neuromuscular Techniques, Volume 2 (Second Edition), Oxford: Churchill Livingstone, pp. 211–297, ISBN 978-0-443-06815-7, retrieved January 17, 2021
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