Name

# Iliocostalis Lumborum

Pronunciation

(il-e-o-kos-TA-lus lum-BOR-um)

Origin/Proximal Attachment

Common tendinous origin & medial iliac crest.

Insertion/Distal Attachment

Lower border of ribs (6), 7-12

Action/Relevance

Extends, laterally flexes & assists in rotation of the vertebral column; can depress the ribs

Innervation

Lower thoracic & upper lumbar nerves

Notes

Is inserted, by six or seven flattened tendons, into the inferior borders of the angles of the lower six or seven ribs.