In the lumbar spine, three joints are located between each two adjacent vertebrae: one disc joint and two paired (left and right) facet joints.
A healthy joint is both mobile and stable. However, some sources are concerned about the psoas major’s compression/stabilization effect upon the spine.
The psoas major’s sagittal plane lumbar spine joint action is by far its most controversial function. The term “psoas paradox” describes this controversy.
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.
The psoas major is first and foremost, a muscle of the hip joint; however it is more complicated because it also crosses the spinal joints.
The Psoas Major may hold the distinction of being the most important as well as the most misunderstood muscle in the human body.
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.
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