KH 2220Laura Abbott, MS, LMT

Day 20Muscles of the Pelvis

Quadratus Lumborum, Iliopsoas, Deep Six Hip Rotators, Gluteals

Quadratus Lumborum• “Hip Hiker Muscle”• O: Posterior iliac crest• I: Transverse Process of L 1-5 and inferior border of rib 12• A:

– Unilaterally: laterally tilts pelvis, laterally flexes vertebral column, assists in back extension

– Bilaterally: fix the last rib during inhalation, assists in back extension and forced exhalation

Iliacus• O: iliac fossa and

base of sacrum

• I: greater psoas tendon and lesser trochanter of femur

• A: flexes thigh, laterally rotates hip, adducts hip

Psoas

• O: Bodies and TPs of lumbar vertebrae

• I: lesser trochanter of femur

• A: flexes thigh or trunk, laterally rotates, and adducts hip.

Iliopsoas

• a compound muscle consisting of the iliac and psoas major muscles.

• A: Hip and trunk flexion

Deep Six Hip Rotators• Piriformis• Quadratus Femoris• Gemellus Superior• Gemellus Inferior• Obturator Internus• Obturator Externus

• All are external rotators of the hip

Deep Six: Piriformis

• O: anterior surface of sacrum

• I: upper border of greater trochanter

• A: rotates thigh laterally, abducts hip when hip is flexed.

Gluteal Maximus• O: posterior iliac crest,

dorsal surface of sacrum and coccyx, sacrotuberous ligament

• I: iliotibial tract of fascia lata, gluteal tuberosity of femur

• A: All fibers extend, laterally rotate, and abducts hip. – Lower fibers adduct hip

Gluteal Medius• O: lateral surface of ilium

between anterior and posterior gluteal lines

• I: greater trochanter of femur

• A: All fibers abduct hip– Anterior fibers flex and

medially rotate hip– Posterior fibers extend and

laterally rotate hip

Gluteal Minimus

• O: lateral surface of ilium between anterior and inferior gluteal lines

• I: greater trochanter of femur

• A: abducts, rotates thigh medially, flexes hip.