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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
Sacrum/Illiac Crest/Spinous Processes of lower lumbar/thoracic vertebrae
intercostal and lumbar arteries
posterior branch of spinal nerve
Actions Unilaterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column.
Rectus abdominis muscle
Gray's p.399
TA A04.3.02.005
FMA FMA:77177
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 ventralis (serratus anterior).

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]

External links[edit]

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