Iliacus muscle

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Iliacus muscle
Iliacus muscle06.png
Position of iliacus muscle (shown in red.)
Anterior Hip Muscles 2.PNG
The iliacus and nearby muscles
Latin musculus iliacus
Gray's p.467
Origin upper two-third of the iliac fossa
Insertion base of the lesser trochanter of femur
Artery medial femoral circumflex artery, iliac branch of iliolumbar artery
Nerve femoral nerve
Actions flexes and rotates laterally thigh
Antagonist Gluteus maximus
Anatomical terms of muscle

The iliacus (/ɨˈl.əkəs/) is a flat, triangular muscle which fills the iliac fossa.

Structure[edit]

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 as which 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 extends distally over the lesser trochanter. [1]

Innervation[edit]

The iliopsoas is innervated by the femoral nerve and direct branches from the lumbar plexus.[2]

Function[edit]

In open-chain movements, as part of the iliopsoas, the iliacus is important for lifting (flexing) the femur forward. In closed-chain movements, the iliopsoas bends the trunk forward and can lift the trunk from a lying posture (i.e. sit-ups) 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.[1]

Additional images[edit]

Notes[edit]

  1. ^ a b Platzer (2004), p 234
  2. ^ Thieme Atlas of Anatomy (2006), p 422

References[edit]

  • Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (5th ed.). Thieme. ISBN 3-13-533305-1. 
  • Thieme Atlas of Anatomy: General Anatomy and Musculoskeletal System. Thieme. 2006. ISBN 1-58890-419-9. 

External links[edit]