Iliacus muscle

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Iliacus muscle
The iliacus and nearby muscles
Right hip bone. Internal surface. (Iliac fossa visible at upper left.)
Latin musculus iliacus
Gray's subject #127 467
Origin: iliac fossa
Insertion: lesser trochanter of femur
Artery: medial femoral circumflex artery, iliac branch of iliolumbar artery
Nerve: femoral nerve
Action: flexes and rotates laterally thigh
Antagonist: Gluteus maximus
Dorlands/Elsevier m_22/12549271

The Iliacus is a flat, triangular muscle, which fills the iliac fossa.

It arises from the upper two-thirds of this fossa, and from the inner lip of the iliac crest; behind, from the anterior sacroiliac and the iliolumbar ligaments, and base of the sacrum; in front, it reaches as far as the anterior superior iliac spine and anterior inferior iliac spine, and the notch between them.

The fibers converge to be inserted into the lateral side of the tendon of the Psoas major, which contributes to flexing the femur anteriorly onto the pelvis. Some of the iliacus fibers may reach the body of the femur, for about 2.5 cm. below and in front of the lesser trochanter.

The Iliacus is sometimes considered a part of the Iliopsoas group of hip flexor muscles.

This muscle is innervated by the anterior branches of the Femoral nerve (anterior branches of L2-3).

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External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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