The psoas minor muscle is a special skeletal muscle. The muscle is one of the inner muscles of the hip. The special feature of the psoas minor muscle is that only a part of the people have the muscle. So it's an inconsistent muscle that only about 50 percent of people own. In the medical literature, the psoas minor muscle is also sometimes considered part of the iliopsoas muscle.

What is the psoas minor muscle?

The medical name Musculus psoas minor roughly means something like 'small loin muscle'. The psoas minor muscle is a so-called skeletal muscle located in the lower extremity. Specifically, the psoas muscle is located in the anterior layer of the posterior musculature of the hip.

Not every person has the psoas minor muscle. Instead, it is only present in about half of all people. The psoas minor muscle forms a functional unit with the psoas major muscle. It is the large lumbar muscle. Also part of this functional unit is the iliopsoas muscle, the lumbar iliac muscle.

The psoas muscle originates from the twelfth thoracic vertebra and the first lumbar vertebra. The psoas muscle has a long tendon that extends to a fascia of the psoas major muscle. In addition, the psoas minor muscle radiates to the arc iliopectineus. The psoas minor muscle is innervated by the anterior branches of the so-called Nervi lumbales number one to three.

Anatomy & Construction

The beginning of the psoas minor muscle lies in the body of the twelfth thoracic vertebra and the first lumbar vertebra. The psoas minor muscle has a long tendon, which extends into a special fascia, the so-called iliac fascia. This fascia encloses the psoas minor muscle together with the muscle of the ilium and the great lumbar muscle. As a result, the psoas minor muscle fits into a curved ligament, the iliopectine arch. This ligament is located between the eminence iliopubica on the pubis and the inguinal ligament (medical term ligament inguinale).

Mammals with four legs also possess a psoas minor muscle. This originates not from the lumbar iliac muscle but from a tiny cusp in the region of the iliac bone, the so-called Tuberculum musculi psoas minoris. The psoas minor muscle is particularly long and narrow and is located near the hip joint. He has a ventral course, which is based on the Iliopsoas. The two muscles together form the subgroup of the so-called internal hip muscles.

The long tendon of the muscle is connected to the iliopubica eminentia and the pecten ossis pubis. In addition, there are several connections to the iliac fascia. The psoas minor muscle is innervated directly via extensions of the lumbar plexus. In principle, the psoas minor muscle is located in the depths of the abdomen. For this reason, he can not be felt from the outside as good as not. In those people who do not have the psoas minor muscle, there is often a tender ligament or an extension of the iliosoplasm.

Function & Tasks

The tasks of the psoas minor muscle are rather limited. Since it is a very small lumbar muscle, which is not present in all humans, its meaning is not particularly large. But the psoas minor muscle has almost no effect.

It simply causes it to tilt when it is unilaterally strained, and it bends the lumbar spine when it is strained on both sides. However, he works together with other muscles in the area. First and foremost, it supports the ilipsoas muscle. Since the psoas minor muscle is an internal hip muscle, it also stabilizes the pelvis and the hip joint. His contribution to various movements, however, is rather small overall.


Various diseases and complaints are possible in connection with the psoas minor muscle. These differ from person to person in their severity, the severity of the symptoms and the individual clinical picture.

Psoas minor syndrome, for example, is a disease in which the psoas minor muscle is very rigid and barely maneuverable. In healthy individuals, the origin of the muscle is in the pelvis. In the diseased patients, the tendon in many cases extends to the so-called femur. For this reason, it is very susceptible to heavier loads on the lot. Often not only the hip is restricted in terms of movement technology. The spine can also be affected by a malposition.

In addition, the psoas minor muscle is sometimes associated with lower abdominal pain. These conditions often affect adolescent women. The symptomatology is sometimes classified as appendicitis, although it is actually the psoas minor syndrome. In such a case, the discomfort is easy to alleviate by severing the appropriate tendon. Any discomfort or pain from the area of ​​the psoas minor muscle should be presented to a suitable physician as soon as possible. This then initiates appropriate therapeutic measures.

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