NCIt definition : A long, thin striated muscle located in the iliac region anterior to the psoas major
muscle that originates from the twelfth thoracic and first lumbar vertebrae, and inserts
on the pectineal line and ileopubic eminence; it acts as a weak flexor of the trunk.;
Alternative definition : CDISC: A muscle located in the iliac region anterior to the psoas major muscle that
originates from the last thoracic vertebra and ventral surfaces of the lumbar vertebrae
bodies, and attaching caudally to the ileum; the primary function is flexion of the
vertebral column.;