This is a detailed, step by step, description on how to palpate iliocostalis muscle by Keith Bootsma, RMT.

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Origin:
Lumborum: Iliac and Sacral Crests [Erector Spinae]
Thoracis: Ribs 12th to Rib 7th
Cervicis: Angles of Ribs 3 – 6

Insertion:
Lumborum: Ribs 12th to Rib 7th
Thoracis: Ribs 6th to 1st
Cervicis: Transverse Processes of C4 to C6

Functions:
1 Extension of the Trunk @ Neck @ the Spinal Joints
2 Lateral Flexion of the Trunk @ Neck @ the Spinal Joints
3 Ipsilateral Rotation of the Trunk @ Neck @ the Spinal Joints

Nerve:
Dorsal (Posterior) Rami of the Spinal Nerves at the Corresponding Levels