Iliocostalis muscle

Iliocostalis
Deep muscles of the back. (Iliocostalis lumborum visible at bottom right, iliocostalis dorsi visible at center right, and iliocost. cerv. visible at upper right.)
Latin musculus iliocostalis
Gray's subject #115 399
Origin Sacrum/Illiac Crest/Spinous Processes of lower lumbar/thoracic vertebrae
Insertion    Ribs
Artery intercostal and lumbar arteries
Nerve posterior branch of spinal nerve
Actions Laterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column.
Antagonist Rectus abdominis 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 ventralis (serratus anterior).

Iliocostalis cervicis

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

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

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

External links

  • 01:06-06 - "Intrinsic muscles of the back."
  • LUC ili
  • eMedicine Dictionary
  • Dissection at ithaca.edu

This article incorporates text from a public domain edition of Gray's Anatomy.

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