Psoas Major Muscle - Origins, Innervation & Action - Anatomy | Kenhub

This video covers the most important anatomy facts about the psoas major muscle: origin, insertion, innervation and function. Take a closer look at this muscle in our quiz about the inner hip muscles: https://khub.me/pk83m

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The psoas major muscle is part of the iliopsoas muscle, the strongest hip flexor in the human body, and belongs to the inner hip muscles.

It originates from the 1st to 4rd lumbar vertebrae, the costal processes of all lumbar vertebrae and the 12th thoracic vertebrae and inserts at the lesser trochanter of the femur.

The psoas major and iliacus muscles unify in the lateral pelvis shortly before the inguinal ligament becoming the iliopsoas muscle. There they pass below the inguinal ligament through the muscular lacuna together with the femoral nerve. Both muscles are completely surrounded by the iliac fascia.

In this video we will go over the most important aspects of this muscle: origin, insertion, innervation and function:
- 0:12 iliopsoas muscle
- 0:29 psoas major muscle origin and insertion
- 1:00 psoas major innervation
- 1:32 psoas major muscle action: hip flexion, pelvis stabilization, thigh rotation

Want to test your knowledge on the psoas major? Take this quiz on the muscles of hip and thigh: https://khub.me/mn68j

Read more on the anatomy and some clinical correlates of the iliopsoas in this article: https://khub.me/2wepf

For more engaging video tutorials, interactive quizzes, articles and an atlas of Human anatomy and histology, go to https://khub.me/v2gup