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Iliacus muscle

Flat, triangular muscle which fills the iliac fossa

Field	Value
Name	Iliacus muscle
Latin	musculus iliacus
Image	Iliacus muscle06.png
Caption	Position of iliacus muscle (shown in red)
Image2	Anterior Hip Muscles 2.PNG
Caption2	The iliacus and nearby muscles
Origin	Upper two-thirds of the iliac fossa
Insertion	Base of the lesser trochanter of femur
Action	Flexes and
Antagonist	Gluteus maximus
Blood	Medial femoral circumflex artery, iliac branch of iliolumbar artery
Nerve	Femoral nerve
pronunciation

The iliacus is a flat, triangular muscle which fills the iliac fossa. It forms the lateral portion of iliopsoas, providing flexion of the thigh and lower limb at the acetabulofemoral joint.

Structure

The iliacus arises from the iliac fossa on the interior side of the hip bone, and also from the region of the anterior inferior iliac spine (AIIS). It joins the psoas major to form the iliopsoas. It proceeds across the iliopubic eminence through the muscular lacuna to its insertion on the lesser trochanter of the femur. Its fibers are often inserted in front of those of the psoas major and extend distally over the lesser trochanter.

Nerve supply

The iliopsoas is innervated by the femoral nerve and direct branches from the lumbar plexus.

Function

In open-chain exercises, as part of the iliopsoas, the iliacus is important for lifting (flexing) the femur forward (e.g. front scale). In closed-chain exercises, the iliopsoas bends the trunk forward and can lift the trunk from a lying posture (e.g. sit-ups, back scale) because the psoas major crosses several vertebral joints and the sacroiliac joint. From its origin in the lesser pelvis the iliacus acts exclusively on the hip joint.

Additional images

File:Iliacus muscle - animation05.gif|Position of iliacus muscle (shown in red). Animation. File:Gray236.png|Right hip bone. Internal surface. Iliac fossa visible at upper left.

Notes

References

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References

Davenport, Kathleen L.. (2019-01-01). "Chapter 9 - The Professional Dancer's Hip". Elsevier.
Platzer (2004), p 234
''Thieme Atlas of Anatomy'' (2006), p 422

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

hip-flexors hip-muscles iliopsoas-muscles muscles-of-the-lower-limb

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