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.)
Latin	musculus iliocostalis
Gray's	subject #115 399
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	Laterally: Flex the head and neck to the same side. Bilaterally: Extend the vertebral column.
Antagonist	Rectus abdominis 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).

Contents 1 Iliocostalis lumborum 2 Iliocostalis dorsi 3 Iliocostalis cervicis 4 See also 5 External links

[edit] 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.

[edit] 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.

[edit] 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.

[edit] See also

• Semispinalis muscle
• Erector spinae
• Longissimus
• Spinalis

[edit] External links

• SUNY Figs 01:06-06 - "Intrinsic muscles of the back."
• LUC ili
• iliocostalis+%28muscle%29 at eMedicine Dictionary
• Dissection at ithaca.edu

v • d • e List of muscles of torso (TA A04.3-5, GA 4.397) Back splenius (capitis, cervicis) · erector spinae (iliocostalis, longissimus, spinalis) · latissimus dorsi transversospinales: (semispinalis dorsi, semispinalis cervicis, semispinalis capitis, multifidus, rotatores) · interspinales · intertransversarii Vertebral column: trapezius · latissimus dorsi · rhomboid (major, minor) · levator scapulae fascia: Thoracolumbar fascia Thorax intercostales (external, internal, innermost) · subcostales · transversus thoracis · levatores costarum · serratus posterior (inferior, superior) · diaphragm Thoracic cavity: pectoralis major · pectoralis minor · subclavius · serratus anterior fascia: Pectoral fascia · Clavipectoral fascia Abdominopelvic Abdomen/ wall Anterior/ lateral Abdominal external oblique · Transversus abdominis/Conjoint tendon · Rectus sheath (rectus abdominis, pyramidalis) · Arcuate line · Tendinous intersection Cremaster · Abdominal internal oblique Fascia/abdominal fascia: panniculus adiposus (Fascia of Camper) · stratum membranosum (Fascia of Scarpa) · Transversalis fascia (Interfoveolar ligament) Linea alba · Linea semilunaris · Inguinal triangle Inguinal canal (Deep inguinal ring, Superficial inguinal ring, Intercrural fibers, Crura of superficial inguinal ring) Inguinal ligament (Pectineal ligament, Lacunar ligament, Reflected ligament) Posterior quadratus lumborum · psoas major/psoas minor · iliacus  · iliopsoas fascia (Iliac fascia/Iliopectineal arch) Pelvis levator ani (iliococcygeus, pubococcygeus, puborectalis) · coccygeus fascia/pelvic fascia visceral (Rectovaginal fascia, Rectoprostatic fascia) · parietal (Obturator fascia/Tendinous arch, Piriformis fascia) floor/diaphragm: Superior fascia of pelvic diaphragm (Pubovesical ligament, Puboprostatic ligament) · Inferior fascia of pelvic diaphragm Anococcygeal body

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.