Iliocostalis

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.)
Details
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	Unilaterally: laterally flex the vertebral column to the same side. Bilaterally: Extend the vertebral column.
Antagonist	Rectus abdominis muscle
Identifiers
Latin	musculus iliocostalis
TA	A04.3.02.005
FMA	77177
*Anatomical terms of muscle* [edit on Wikidata]

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 posterior).

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.

References

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

External links

Anatomy figure: 01:06-06 at Human Anatomy Online, SUNY Downstate Medical Center - "Intrinsic muscles of the back."
Dissection at ithaca.edu

Muscles of thorax and back

Back

splenius	capitis cervicis

erector spinae	iliocostalis longissimus spinalis

transversospinales	semispinalis thoracis semispinalis cervicis semispinalis capitis multifidus rotatores interspinales intertransversarii

Vertebral column	trapezius latissimus dorsi rhomboid major minor levator scapulae

Fascia	thoracolumbar fascia

Thorax

Intercostal muscle external internal innermost subcostalis transversus thoracis levatores costarum serratus posterior inferior superior thoracic diaphragm

Thoracic cavity	pectoralis major pectoralis minor subclavius serratus anterior sternalis

Fascia	pectoral fascia clavipectoral fascia

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