Ivan Zamorano

Acupunture Treatment

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

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