Menu Close

Iliocostalis Lumborum Muscle

(Sample Lesson)

Muscle Description

The iliocostalis lumborum muscle lies lateral to the longissiumus muscle group and deep to the serratus posterior muscle. It s a part of the erector spinae muscles that function to straighten and laterally flex the vertebrae column.

Iliocostalis Lumborum Muscle - superficial view
Iliocostalis Lumborum Muscle - deep view

Muscle Attachments

Origin: medial and lateral sacral crests; medial iliac crest.

Insertion: angles of ribs 6 or 7 – 12.

Iliocostalis Lumborum Muscle - attachments (origin and insertion)

Muscle Actions

Bilaterally (both) muscle contraction:
Extend the vertebral column.

Flexion of the vertebral column

Unilateral (one) muscle contraction:
Laterally flex the vertebral column
to the same side.

Lateral flexion of the vertebral column

Muscle Nerve Supply

Dorsal primary rami of thoracic and lumbar spinal nerves (T7 to L3).


Scroll top icon