What is the origin and insertion of the psoas muscle?

Answer 1

Psoas major originates along the lateral surfaces of the vertebral bodies of TXII and LI-LIV and their associated invertebral discs. Psoas minor, present in only some 50 per cent of the population, originates at the transverse processes of LI-LV. Iliacus originates in the Iliac fossa of the pelvis. Psoas major unites with iliacus at the level of the inguinal ligament and crosses the hip joint to insert on the lesser trochanter. Psoas minor inserts at the iliopectineal arch, the thickened band at the iliac fascia which separates the muscular lacuna from the vascular lacuna