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The Iliocostalis is a member of the Erector Spinae (Paraspinal*) group, composed of:
- Sacrum and iliac crest to ribs to C4.
- Extends the neck and trunk at the spinal joints.
- Laterally flexes the neck and trunk at the spinal joints.
- Ipsilaterally rotates the neck and trunk at the spinal joints.
- Anteriorly tilts the pelvis at the lumbosacral joint.
- Ipsilaterally elevates the pelvis at the lumbosacral joint.
- The iliocostalis is the most lateral of the three subgroups of the erector spinae group.
- The name iliocostalis tells us that this muscle group attaches from the ilium to the ribs (cost means ribs).
- Some sources call the iliocostalis the iliocostocervicalis, indicating that this muscle group extends up into the cervical spine.