Name

Iliocostalis Thoracis

Pronunciation

il-e-o-kos-TA-lus tho-RA-sus

Origin/Proximal Attachment

Upper border of ribs 6-12(medial to lumborum’s insertion)

Insertion/Distal Attachment

Lower border of angles of ribs1-6 (sometimes transverse process of C7)

Action/Relevance

Extends, laterally flexes & assists in rotation of thoracic vertebrae

Innervation

C8 & T1-6 nerves