Iliocostalis

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Iliocostalis
Iliostalis.png
Deep muscles of the back. (Iliocostalis lumborum visible at bottom right, iliocostalis dorsi visible at center right.)
Details
Origin sacrum, iliac crest, thoracolumbar fascia, spinous processes of vertebrae from T11 - L5
Insertion Ribs
Artery intercostal and lumbar arteries
Nerve posterior branch of spinal nerve
Actions Unilaterally: laterally flex the vertebral column to the same side. Bilaterally: Extend the vertebral column.
Antagonist Rectus abdominis muscle
Identifiers
Latin musculus iliocostalis
TA98 A04.3.02.005
TA2 2257
FMA 77177
Anatomical terms of muscle

Iliocostalis muscle 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. It laterally flexes the vertebral column to the same side.

Contents

Structure

Iliocostalis muscle has a common origin from the iliac crest, the sacrum, the thoracolumbar fascia, and the spinous processes of the vertebrae from T11 to L5. [1]

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 thoracis (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 (iliocostalis muscle; sacrolumbalis muscle) is inserted, by flattened tendons, into the inferior borders of the angles of the lower six to nineribs. [1]

Nerve supply

Iliocostalis muscle is supplied by the dorsal rami of spinal nerves. [1]

Function

Iliocostalis muscle laterally flexes the vertebral column to the same side. [1] It bilaterally extends the vertebral column. [1]

See also

Related Research Articles

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<span class="mw-page-title-main">Iliac crest</span> Top border of the hip

The crest of the ilium is the superior border of the wing of ilium and the superiolateral margin of the greater pelvis.

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The following outline is provided as an overview of and topical guide to human anatomy:

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The pelvis is the lower part of the trunk, between the abdomen and the thighs, together with its embedded skeleton.

<span class="mw-page-title-main">Vertebral column</span> Bony structure found in vertebrates

The vertebral column, also known as the backbone or spine, is part of the axial skeleton. The vertebral column is the defining characteristic of a vertebrate in which the notochord found in all chordates has been replaced by a segmented series of bone: vertebrae separated by intervertebral discs. Individual vertebrae are named according to their region and position, and can be used as anatomical landmarks in order to guide procedures such as lumbar punctures. The vertebral column houses the spinal canal, a cavity that encloses and protects the spinal cord.

<span class="mw-page-title-main">Vertebra</span> Bone in the vertebral column

The spinal column, a defining synapomorphy shared by nearly all vertebrates, is a moderately flexible series of vertebrae, each constituting a characteristic irregular bone whose complex structure is composed primarily of bone, and secondarily of hyaline cartilage. They show variation in the proportion contributed by these two tissue types; such variations correlate on one hand with the cerebral/caudal rank, and on the other with phylogenetic differences among the vertebrate taxa.

References

PD-icon.svgThis article incorporates text in the public domain from page 399 of the 20th edition of Gray's Anatomy (1918)

  1. 1 2 3 4 5 Chaitow, Leon; DeLany, Judith (2011-01-01). "Chapter 10 - The lumbar spine". Clinical Application of Neuromuscular Techniques. Vol. 2 (2nd ed.). Churchill Livingstone. pp. 211–297. doi:10.1016/B978-0-443-06815-7.00010-3. ISBN   978-0-443-06815-7.{{cite book}}: CS1 maint: date and year (link)