Iliocostalis

 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.

Iliocostalis
Deep muscles of the back. (Iliocostalis lumborum visible at bottom right, iliocostalis dorsi visible at ce
Details
Origin	Sacrum, iliac crest, spinous processes of lower lumbar, thoracic vertebrae
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 cervicisEdit

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 thoracisEdit

The 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 lumborumEdit

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.

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.