Iliocostalis

Iliocostalis
Iliocostalis
	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 [edit on Wikidata]

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.

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 nine ribs.^[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]

References

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

^ ^a ^b ^c ^d ^e 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.

External links

Anatomy figure: 01:06-06 at Human Anatomy Online, SUNY Downstate Medical Center – "Intrinsic muscles of the back."
Dissection at ithaca.edu Archived 2007-03-10 at the Wayback Machine