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

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


Hello again, everyone! It’s Matt from Kenhub,
and in this tutorial, we will discuss the anatomy, innervation, and function of the
iliopsoas muscle. The iliopsoas muscle belongs to the inner
hip muscles. It consists of a complex of two muscles with different areas of origin. The iliopsoas belongs to the striated musculature,
and the innervation is carried by the femoral nerve as well as the direct branches of the
lumbar plexus, both seen highlighted in green on these images. The iliopsoas muscle consists 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 vertebrae and inserts at the lesser trochanter of the femur. The iliacus muscle originates from the iliac
fossa and inserts with the psoas major at the lesser trochanter. The psoas major and
the 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 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, which makes it an important muscle 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
and say hello to your new anatomy learning partner, Kenhub! See you there! https://www.kenhub.com

15 Replies to “Iliopsoas Muscle: Action / Function, Anatomy & Innervation – Human Anatomy | Kenhub”

  • I'm studying relieving hip flexors pain at home and discovered a great resource at Fergs Pain Ease (google it if you are interested)

  • Iliopsoas DOES NOT support the straightening the upper body! Wow! Where does this idea come from? It does just the opposite! Muscles work by CONTRACTING themselves! Think about it! Also, it is misleading to say that it is the strongest hip flexor , unless a person is a paraplegic and this is the only hip flexor it has. Look at where psoas attaches to the femour! Trying to flex the hip joint (raising the knee), would be just as productive as trying to open a door with a knob that is placed right next to its hinges! Psoas pulls the upper body down towards one's lower extremities: that's the muscle that keeps you from falling backwards while sitting! So it sort of does flex the hip, but by pulling the UPPER body toward one's knees, not vice versa, as it is shown in this animation!

  • Hi everyone! We hope you enjoyed watching this short video tutorial on the iliopsoas muscle! Have you mastered the anatomy of this muscle yet? Remember, there's lots more where this came from, head on to our website right now: https://khub.me/zb7ih
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  • I think my ileopsoas is misbehaving for years now after I had a stroke. Tomorrow I’m going to have a sports massage, hopefully the massage therapist can bring some relieve to this muscle.

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