Serratus posterior inferior muscle

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Serratus posterior inferior muscle
Muscles connecting the upper extremity to the vertebral column (serratus posterior inferior labeled at center right).
Serratus posterior inferior (red) seen from back.
Details
OriginVertebrae: Spinous processes of T11 - L2
InsertionThe inferior borders of the 9th through 12th ribs
ArteryIntercostal arteries
NerveIntercostal nerves T9 through T12
ActionsDepress the lower ribs 9-12, aiding in expiration
Identifiers
Latinmusculus serratus posterior inferior
TA98A04.3.01.010
TA22235
FMA13402
Anatomical terms of muscle

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

Structure[edit]

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 aponeurosis from the spinous processes of the lower two thoracic and upper two or three lumbar vertebrae.[1]

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[edit]

The serratus posterior inferior draws the lower ribs backward and downward to assist in rotation and extension of the trunk.[1] This movement of the ribs may also contribute to inhalation and forced expiration of air from the lungs.[2]

Additional images[edit]

See also[edit]

References[edit]

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

  1. ^ a b c d e 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
  2. ^ 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

External links[edit]