Iliopsoas Muscle: Action / Function, Anatomy & Innervation - Human Anatomy | Kenhub

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: https://khub.me/7n077

Oh, are you struggling with learning anatomy? We created the ★ Ultimate Anatomy Study Guide ★ to help you kick some gluteus maximus in any topic. Completely free. Download yours today:
https://khub.me/oeznx

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:
https://khub.me/965pt

Read more on the anatomy and some clinical correlates of the iliopsoas in this article:
https://khub.me/vfym4

For more engaging video tutorials, interactive quizzes, articles and an atlas of Human anatomy and histology, go to https://khub.me/mqb1i