Anatomy

Origin

Bases of transverse processes of last thoracic and first lumbar vertebrae, bodies of twelfth thoracic and first lumbar vertebrae, intervertebral disk above first lumbar vertebra

Insertion

It ends in a long flat tendon which is inserted into the pectineal line and ilio-pectineal eminence, and, by its lateral border, into the iliac fascia

Nerve

Branches from lumbar plexus (L2, L3) and sometimes L1 or L4

Actions

Flexes vertebral column. This muscle has little function and is frequently absent