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

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

Hello again everyone! This is Matt from Kenhub, and in this tutorial,
we will talk about the psoas major muscle, its origin, insertion, innervation and function. The psoas major muscle is part of a team of
two muscles that compose the iliopsoas muscle. The iliopsoas muscle belongs to the inner
hip muscles and is made up of the psoas major and the iliacus muscles. The psoas major muscle originates from the
first to fourth lumbar vertebrae, the costal processes of all lumbar vertebrae and the
twelfth thoracic vertebra, and inserts at the lesser trochanter of the femur. The psoas major and iliacus muscle 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. The innervation of the psoas major is carried
by the direct branches of the lumbar plexus. The lumbar plexus lies dorsally from the psoas
major muscle which is penetrated by the genitofemoral nerve. Medially from the psoas major runs the sympathetic
trunk. The iliopsoas muscle is the strongest flexor
of the hip joint, a function which is important for walking. In the supine position, it decisively supports
the straightening of the upper body, for example, during sit-ups. Furthermore, it rotates the thigh laterally. A unilateral contraction leads to a lateral
flexion of the lumbar vertebrae column. Altogether, the iliopsoas muscle plays a significant
role in the movement and stabilization of the pelvis. This video is more fun than reading a textbook,
right? If you want more videos, interactive quizzes,
articles, and an atlas of human anatomy, click on the “Take me to Kenhub” button. It is time to say goodbye to your old textbooks
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7 Replies to “Psoas Major Muscle – Origins, Innervation & Action – Anatomy | Kenhub”

  1. I would really love if we could get the latin names. It is so hard to understand what you are talking about, when we learn the Latin words in our university.

  2. #KenHub I would love to see a video on what happens if one has a mass in the muscle compartment I found out I do last year and it can't be removed I'd love to know what to expect

  3. Hi everyone! What do you think about our new tutorial about the psoas major? Give us your feedback in the comments! 🙂 Are you ready to test your knowledge? Check out our quiz about the muscles of the hip and thigh available to premium members: Good luck!

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