The lumbosacral spine should have a healthy anterior pelvic tilt and lumbar lordosis. If they are excessive, the client has lower crossed syndrome.
Psoas Major Function: Spinal Joint Actions – Frontal and Transverse Planes
The frontal plane spinal action of the psoas major is fairly clear; it crosses the spinal joints laterally, so it lateral flexes the spine to that side.
Introduction to the Cervical Spine
It is extremely important to be able to locate and palpate the laminar groove of the cervical spine because the thickest musculature is located there.