Psoas major anatomy: The psoas major is a deep muscle that originates from the transverse processes, vertebral bodies, and intervertebral discs of T12 to L5. It travels downward through the pelvic cavity, passes deep to the inguinal ligament, and inserts into the lesser trochanter of the femur. Along its course, it lies adjacent to the lumbar plexus, ureter, and abdominal aorta. It’s innervated by branches of the lumbar plexus, primarily from spinal nerves L1 to L3, and occasionally L4. Function

THOMAS TEST FOR ILIOPSOAS LENGTH The Thomas Test is a great quick test to assess the length of your patients hip flexors. If the the extended leg does not remain on the treatment bench during contralateral hip flexion, this is a sign of a shortened iliopsoas muscle. Peeler et al. (2007) have evaluated the test's reliability and found an intra-rater reliability of 0.47 and an inter-rater reliability of 0.52 for the visual method. Using a goniometer yielded slightly better results. Nonetheless, th

HIP ASSESSMENT SERIES PART 13: THOMAS TEST FOR ILIOPSOAS TIGHTNESS Hip flexion can be impaired not only to a tight rectus femoris muscle but more often than not due to tightness of the iliopsoas muscle. The Thomas test is the most common quick test to assess for contractures or tightness of this muscle that runs from the lateral part of the segments T12-L4 and the iliac fossa to the lesser trochanter. | Physiotutors

You never really felt the Psoas muscle stretch completely, till you isolated it with this unique Kinesiological Stretching technique called ~Stability~. | Easyflexibility - Stretching Made Easy