Iliocostalis

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Iliocostalis
Iliostalis.png
Deep muscles of the back. (Iliocostalis lumborum visible at bottom right, iliocostalis dorsi visible at ce
Details
OriginSacrum/Illiac Crest/Spinous Processes of lower lumbar/thoracic vertebrae
InsertionRibs
Arteryintercostal and lumbar arteries
Nerveposterior branch of spinal nerve
ActionsUnilaterally: laterally flex the vertebral column to the same side. Bilaterally: Extend the vertebral column.
AntagonistRectus abdominis muscle
Identifiers
Latinmusculus iliocostalis
TAA04.3.02.005
FMA77177
Anatomical terms of muscle

The iliocostalis is the muscle immediately lateral to the longissimus that is the nearest to the furrow that separates the epaxial muscles from the hypaxial. It lies very deep to the fleshy portion of the serratus posterior muscle[disambiguation needed].

Iliocostalis cervicis[edit]

The iliocostalis cervicis (cervicalis ascendens) arises from the angles of the third, fourth, fifth, and sixth ribs, and is inserted into the posterior tubercles of the transverse processes of the fourth, fifth, and sixth cervical vertebrae.

Iliocostalis dorsi[edit]

The iliocostalis dorsi (musculus accessorius; iliocostalis thoracis) arises by flattened tendons from the upper borders of the angles of the lower six ribs medial to the tendons of insertion of the iliocostalis lumborum; these become muscular, and are inserted into the upper borders of the angles of the upper six ribs and into the back of the transverse process of the seventh cervical vertebra.

Iliocostalis lumborum[edit]

The iliocostalis lumborum (iliocostalis muscle; sacrolumbalis muscle) is inserted, by six or seven flattened tendons, into the inferior borders of the angles of the lower six or seven ribs.

See also[edit]

References[edit]

This article incorporates text in the public domain from page 399 of the 20th edition of Gray's Anatomy (1918)

External links[edit]