Iliacus – Functional Anatomy

Iliacus is the most simple and direct hip flexor connecting the coxal bone to the femur as it passes over the hip joint. It is part of the iliopsoas complex or deep abdominals.

It is a flat triangular muscle that blends with the fibers of psoas major as it passes over the pubic bone and extends toward the lesser trochanter.

There are infrequent anomalies in how a portion may stay separated as it travels to the insertion on the lesser trochanter or has a split belly. Here is one of the studies on its variations.

Origin – Iliac fossa of the ilium

Insertion – lesser trochanter of the femur

Function – flexion of the hip

Here’s a picture of iliacus as it fits into the iliopsoas complex and blends with psoas major.



This site is undergoing changes. Starting in early 2020, we began changing the format of the posts to include more extensive self-care, illustrations, therapist notes, anatomy, and protocols. We’d love your feedback. We are adding posts and converting the old posts as quickly as time permits.


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Is the pain from
degenerative discs or
trigger points in the muscle?

This post discusses the differences in pain from disc problems and pain from trigger points. Who should you see to help with your pain?

Tony Preston has a practice in Atlanta, Georgia where he sees clients. He has written and taught about anatomy, trigger points, and cranial therapies since the mid-90s.

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*This site is undergoing major changes. We are reformatting and expanding the posts to make it easier to read, more accessible, and
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