Name
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