Pelvis  Origin Insertion  Action  Notes 
Gluteus maximus Posterior ilium, sacrum coccyx Femur (greater trochanter) and Iliotibial band Forceful extension of the hip, lateral rotation of extended hip, abduct hip (IT band), lower fibers (inserting on trochanter) adduct hip,
External rotation
stabilizes knee
 
 
 

 

Gluteus medius Ilium between posterior and anterior gluteal lines (below crest) Greater trochanter of femur Abducts and rotates thigh medially (internally), abducts, flexes and extends the hip stabilizes pelvis

 

Gluteus minimus Posterior ilium between anterior and inferior gluteal lines Anterior surface of greater trochanter of femur Abducts and medially (internally) rotates thigh, stabilizes pelvis on femur stabilizes pelvis

 

Tensor fascia latae Anterior iliac crest (posterior to anterior superior iliac spine) Iliotibial band which continues to attach to lateral condyle of tibia Flexes, internally:
rotates and abducts thigh,
prevents collapse of extended knee in walking
 
Psoas major Lumbar vertebrae, T12-L5
Bodies and transverse processes 
Lesser trochanter of femur Flexion of hip

When femur is stabilized it may increases the lordotic curve in the lumbar spine and rotates the pelvis downward.

Alternate theory: acting with posterior transversospinalis act to erect (lift or straighten) the spine

Provides support for the spine and maintains disc space when functioning properly.
 
 
 
 
 
 

 

Iliacus Iliac fossa Lesser trochanter of the femur Flexes, laterally rotates and adducts the hip

With femur fixed, acts in rotating pelvis anteriorly

 
Piriformis Anterior surface of the sacrum Greater trochanter of femur External rotation of femur

Adducts the thigh when the hip is flexed

With femur fixed, bilaterally moves pelvis backward (decreasing lordosis); unilaterally medially rotates pelvis

 
 Deep lateral rotators
(Superior and Inferior Gemelli, Obturator Internus and Externus, Quadratus femoris)
Ischium, obturator foramen  Trochanter  Laterally rotate thigh, stabilize hip   

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