(anatomy) The lateral portion of the erector spinal muscle that extends the vertebral column and assists in lateral movements of the trunk.
Iliocostalis
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(′il·ē·ō′kä′sta·ləs)
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sacropinalis
A lateral member of the erector spinae group of muscles. The iliocostalis extends from the pelvis to the neck and divides into three regional pacts: the iliocostalis lumborum, iliocostalis thoracis, and the iliocostalis cervicis. Its origins are on the iliac crest and thoracic ribs. The insertions are on the ribs. The iliocostalis extends the vertebral column and helps to maintain an erect posture. When acting unilaterally, it bends the vertebral column sideways.
| Wikipedia: Iliocostalis |
| Iliocostalis | |
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| 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 |
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.
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 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.
See also
External links
- SUNY Figs 01:06-06 - "Intrinsic muscles of the back."
- LUC ili
- iliocostalis+%28muscle%29 at eMedicine Dictionary
- Dissection at ithaca.edu
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Learn More
 | lateral flexion |
| erector spinae |
| Erector spinae |
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| Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved. Read more |
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