Gluteal Region and Posterior Thigh OIIA

gluteus maximus origin

-lateral surface of ilium (dorsal to posterior gluteal line)

-dorsal surface of sacrum and coccyx (from sacrotuberous ligament)

gluteus maximus insertion

-approximately 3/4 of the muscle into the iliotibial band (superior 1/2 of muscle and superficial 1/2 of inferior portion)

-gluteal tuberosity (deep 1/2 of inferior portion)

gluteus maximus action

hip extension

gluteus maximus innervation

inferior gluteal nerve (L5, S1, S2)

piriformis origin

pelvic surface of sacrum

piriformis insertion

medial surface of greater trochanter of femur

piriformis action

lateral rotation of femur

piriformis innervation

nerve to piriformis (S1 and S2)

gluteus medius origin

wing of ilium (between anterior and posterior gluteal lines)

gluteus medius insertion

posterior aspect of greater trochanter (superior surface)

gluteus medius action

-abduction of femur at hip joint

-medially rotate femur (sticking the bill between your butt cheeks and rotating your legs outward)

-maintenance of a level pelvis during gait

gluteus medius innervation

superior gluteal nerve (L4, L5, S1)

gluteus minimus origin

wing of ilium (between anterior and inferior gluteal lines)

gluteus minimus insertion

anterior aspect of greater trochanter (superior surface)

gluteus minimus action

-abduction of femur at hip joint

-medially rotate femur

-maintenance of level pelvis during gait

gluteus minimus innervation

superior gluteal nerve (L4, L5, S1)

tensor fascia lata origin

iliac crest (between ASIS and tubercle)

tensor fascia lata insertion

anterior aspect of iliotibial band

tensor fascia lata action

-flex hip

-possible medially rotates hip

tensor fascia lata innervation

superior gluteal nerve (L4, L5, S1)

obutrator internus origin

-pelvic surface of coxal bone (around periphery of obturator foramen)

-obturator membrane

obturator internus insertion

medial surface of greater trochanter of femur

obturator internus action

lateral rotation of femur at hip joint

obturator internus innervation

nerve to obturator internus (L5, S1)

superior gemellus origin

ischial spine

superior gemellus insertion

superior aspect of obturator internus tendon

superior gemellus action

lateral rotation of femur at hip joint

superior gemellus innervation

nerve to obturator internus and superior gemellus (L5, S1)

inferior gemellus origin

ischial tuberosity

inferior gemellus insertion

inferior aspect of obturator internus tendon

inferior gemellus action

lateral rotation of femur at hip joint

inferior gemellus innervation

nerve to inferior gemellus

quadratus femoris origin

ischial tuberosity

quadratus femoris insertion

-quadrate tubercle

-vertical line extending inferiorly from quadrate tubercle

• on the neck of the femur

quadratus femoris innervation

nerve to inferior gemellus and quadratus femoris

semitendinosus origin

ischial tuberosity (via long flat tendon)

semitendinosus insertion

posteromedial aspect of medal tibial condyle

semitendinosus action

-knee flexion

-medial rotation of tibia

-assists hip extension

semitendinosus innervation

tibial portion of sciatic nerve

semimembranosus origin

ischial tuberosity (via long flat tendon)

semimembranosus insertion

posteromedial surface of the medial tibial condyle

semimembranosus action

-knee flexion

-medial rotation of tibia

-assists with hip extension

semimembranosus innervation

tibial portion of sciatic nerve

bicep femoris (long head) origin

ischial tuberosity (via common tendon with semitendoinosus)

bicep femoris (long head) insertion

fibular head

bicep femoris (long head) action

-knee flexion

-lateral rotation of leg

-assists in hip extension

bicep femoris (long head) innervation

tibial portion of sciatic nerve

bicep femoris (short head) origin

lateral lip of linea aspera (from lateral intermuscular septum)

bicep femoris (short head) insertion

fibular head

bicep femoris (short head) action

-knee flexion

-lateral rotation of leg

bicep femoris (short head) innervation

common peroneal (fibular) portion of sciatic nerve

adductor magnus (ischiocondylar portion) origin

specifically the vertically oriented fibers from ischial tuberosity

adductor magnus (ischiocondylar portion) insertion

adductor tubercle

adductor magnus (ischiocondylar portion) aciton

-adduction of hip

-assists in hip extension

adductor magnus (ischiocondylar portion) innervation

tibial portion of sciatic nerve