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Muscle of the Month: Iliopsoas

The Iliopsoas is a group of 3 muscles: psoas major, psoas minor, and the iliacus. This group, contracting simultaneously, flexes the hip. It is the deepest of the hip flexors, and possibly the strongest as a muscle group.

In this article, we will examine the anatomy of these 3 amazing muscles, understand their roles and functions, look at how they affect your physical, emotional and spiritual self, and explore some stretches and exercises that can add health and freedom to this vital group of muscles.

But first, a little anatomy:

Iliopsoas, pronounced "ill-ee-oh-SO-az" and the Psoas, pronounced phonetically, "SO-as" since the "p" is silent. The Iliacus can be pronounced: "ill-ee-AH-cus."

1. Psoas Major

ACTIONS: Flex the hip, may laterally rotate the hip, Flex the trunk toward the thigh, Tilt pelvis anteriorly, and unilaterally, it assists to laterally flex the lumbar spine.

ORIGIN: Transverse processes of L1-5, bodies of T12-L5 and intervertebral discs below bodies of T12-L4

INSERTION: Lesser trochanter of femur

NERVE INNERVATION: lumbar plexus of L1 - L4

2. Psoas Minor:

ACTIONS: assist to create lordotic curvature in lumbar spine, tilts pelvis posteriorly.

ORIGIN: body and transverse processes of first lumbar vertebrae

INSERTION: superior ramps of pubis

NERVE INNERVATION: lumbar plexus L1, 2

3. Iliacus:

ACTIONS: flex the hip, may laterally rate hip, flex trunk toward thigh, tilt pelvis anteriorly.

ORIGIN: iliac fossa

INSERTION: lesser trochanter

NERVE INNERVATION: femoral L1, 2, 3, 4

In short, this group is located near the body's center of gravity, buried behind abdominal muscles and your intestines. They begin up at the last rib and continue down to the pelvis. They essentially raise your thigh toward your stomach or bring it forward as to walk or run.

The psoas is a muscle that works with two different joints, making it biarticlulate. It is the only muscle that connects our upper body to the lower body.

It's estimated that about 40% of the population do not have the psoas minor muscle, or only have it on one side. The main difference between the major and minor is that the major is the one that connects the femur (leg) to the spine, whereas the minor connects the pelvis to the spine.

The psoas has a wide range of nicknames including: "hidden prankster," "great pretender," and the "flight or fight muscle." Let us look at why this deep muscle has a somewhat notorious bag of nicknames.

Some of the Pain Symptoms of a dysfunctional or imbalanced Psoas:

  • hip pain

  • groin pain

  • hip impingement

  • sciatica

  • SI joint pain

  • low back pain

  • restriction in hip socket

  • iliopsoas tendonitis or bursitis

  • sway back and anterior pelvic tilt, or "butt out" look

  • knee pain

  • hamstring pain

  • piriformis syndrome

Reaching the psoas:

Because of its proximity to other organs, arteries, and nerves, it is a difficult muscle to reach or palpate. In the image below, you can see that bright aqua blue color, which signifies the iliopsoas. I would advise against you to try and palpate the psoas without proper education, tools, or professional help as it lies deep in your core, and risk or injury is indeed possible.

With that said, I would not suggest having an untrained person to go digging deep in this area either.

At the advanced training course I took at the end of March this year at The Lauterstein-Conway Massage school with David Lauterstein, I received hands-on training on this important muscle. What I learned more than anything, however, was that there are a lot of surrounding muscles to the psoas that can have satellite trigger points, or pain, as a result of an imbalanced psoas. Those muscles are easier to work with and brought a lot of relief to tension in the low back, glute, and front of hip area.

Some satellite muscles include:

  • quadratus lumborum

  • rectus abdominus

  • erector spinae

  • multifidus

  • tensor fascia latae

  • gluteus maximus and minimus

  • thoracolumbar paraspinalis

  • piriformis

What I really enjoyed about this continuing education course was working with my partner to release the rectus abdominus. I found it to be so helpful in reducing low back pain that may be associated with a dysfunctional psoas. I love incorporating this work into my sessions as needed because I think it is an over-looked muscle in massage therapy.

Okay back to the muscle of the month: the iliopsoas...

From the book, "Trigger Point Therapy for Myofascial Pain," the author gives great suggestions on stretch exercises and strengthening exercises. Side note, this is great book, in general, if you're interested in learning more about the whole body's muscle pain points.

Example of toe raises strengthening exercise- engaging the core and the psoas:

There are TONS of examples of yoga stretches and other exercises on the internet...just be careful to follow credible teachers.

There is a great pilates studio here in Austin called Core Therapy, where they focus on strengthening the core, while stretching and relaxing other muscles, helping to give balance to the psoas muscle. Cheryl and Stephen Dunn run this lovely pilates and Gyrotonics studio just off of Bee Caves Rd. where they offer a wide range of classes, education, physical therapy and other services to help take control of your core. I took the beginners gyrotonics class and just loved it!

How the psoas plays a role in our energy system and our chakras:

As you probably know, there are 7 basic chakras, or energy centers that exist within the "subtle body" (non-physical), which overlies the physical body. The psoas muscle interconnects the base of spine, or Root Chakra, the second or Sacral Chakra, and the third or Solar Plexus Chakra. When our chakras are balanced, our physical and non-physical self feel balanced.

The psoas plays a vital role in the root chakra, as well as with the quadratus lumborum and the pelvic floor muscles, by helping to stabilize the lumbar and sacral areas. This stabilization is also used for many yoga positions, which can help to connect the body to the mind.

A quote from the book, "The Vital Psoas Muscle," by Jo Ann Staugaard-Jones, wraps up the idea of how yoga, breath work, meditation, and the psoas muscle all work together very well:

"Yoga postures connect the body to the mind.

Breathing connects the mind and body to the unconscious.

Meditation connects the person the universe.

The Psoas Major connects the upper body to the lower body, linking breath to movement, feelings, energy and healing."

This book is awesome in that it lays out a bunch of great stretches and exercises that help balance the psoas and gives great detail about why and how to do them. It also goes into great detail about the chakra balancing work...if you're interested in that too!

It is clear to see why this muscle group is so important for us to take care of and better understand and appreciate.

Thanks for reading, and as always, please feel free to message me with questions, comments or concerns.

Thank you and have a great day!



1. "The Vital Psoas Muscle" book by Jo Ann Staugaard-Jones.


3. "The trigger point therapy workbook" by Clair Davies

4. "Trigger point therapy for myofascial pain" book by Donna Finando and Steven Finando

5. Trail Guide app on phone for muscle insertions and actions

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