The iliopsoas is a compound muscle which formed by the iliacus and psoas major muscles. It originates from the lumbar vertebral column and hip bone, and has its insertion on the femur. Take a closer look at this muscle in our atlas: [ Ссылка ]
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The two muscles which comprise the iliopsoas are:
Psoas major muscle - this muscle has its origin on the bodies of the vertebrae T12-L4 and the costal processes of the vertebrae L1-L5. It then inserts at the lesser trochanter of the femur
Iliacus muscle - originates from the iliac fossa, and inserts at the lesser trochanter, just like the poses major muscle.
The main function of the iliopsoas muscle is flexion of the hip joint , therefore making it an important muscle for walking/gait. In the supine/lying position it decisively assists in the elevation of the torso, e.g. during sit-ups.The iliopsoas muscle also assists in lateral, or external rotation of the thigh at the hip joint.
Unilateral contraction results in lateral flexion of the lumbar vertebral column.
0:24 Innervation
0:45 Psoas major muscle
1:08 Iliacus muscle
1:54 Functions & Actions
Want to test your knowledge on the iliopsoas muscle? Take this quiz:
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Read more on the anatomy and some clinical correlates of the iliopsoas in this article:
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For more engaging video tutorials, interactive quizzes, articles and an atlas of Human anatomy and histology, go to [ Ссылка ]
