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The Psoas uscle
The psoas nerve is the nerve that innervates the psoas major muscle. It is formed by fibers of spinal nerves L2-L4.
psoas major muscle
The psoas muscle starts the the letters "ps."
Iliopsoas or Psoas Major
left lower quadrant
The tenderloin is made up of the psoas major and psoas minor muscles, which start on the cow's lower spine, run through the pelvis and connect to the front of the femur.
Firstly, To understand the Psoas Paradox, the Psoas are a muscle that attaches at 2 ends, that being the transverse process of the T12-L5 and inserts to Lesser trochanter of the hip. Upon contraction this muscle (like all muscle groups) contract at both ends, thereby raising the thigh upwards towards an erect trunk and pulls the lumabr spine into a curve (Lordosis). The paradox of this is that upon passive thigh raising towards the trunk, the lower spine actually rather flattens than becoming more lordotic. This is due to the fact that upon passive flexion of the thigh, the Psoas undergoes compressive strain thereby causing the muscle to be slack about its attatchment (lumbar spine Transverse processes) The difference between active and passive muscle tension is what causes this "Paradox"
psoas
The strongest Flexor of the hip (thigh) is illiopsoas muscle which is the merger of the illiacus and the psoas major muscle. The illiacus is on the medial side of the pelvic bone attaching to the femur and the psoas major muscle attaches from the lumbar vertebrae to the femur.
The Iliopsoas
The psoas is one of the flexors of the hip.