-
os coxa
- is formed from 3 separate boney elements
- the ilium
- the ischium
- the pubis
-
6 deep hip rotators
- piriformis
- superior gemellus
- obturator internus
- inferior gemellus
- obturator externus
- quadratus femoris
-
piriformis
origin
insertion
function
- origin- anterior surface of the sacrum
- insertion- greater trochanter
- function- lateral rotation of the extended thigh, abducts the flexed thigh
- *the muscle passes through the greater sciatic notch*
-
superior gemellus
origin
insertion
function
- origin- ischial spine
- insertion- greater trochanter
- function- lateral rotation of the hip, helps abduct o flexed thigh
-
obturator internus
origin
insertion
function
- origin- obturator foramen
- insertion- greater trochanter of the femur
- function- lateral rotation of the hip, abducts the flexed thigh
-
inferior gemellus
origin
insertion
function
- origin- ischial tuberosity
- insertion- greater trochanter
- function- lateral rotation of the hip, helps abduct a flexed thigh
-
obturator externus
origin
insertion
function
- origin- the external surface of the obturator membrane (foramen)
- insertion- greater trochanter
- function- lateral rotation of hip, helps abduct a flexed thigh
-
quadratus femoris
origin
insertion
function
- origin- ischial tuberosity
- insertion- greater trochanter
- function- lateral rotation
- *this is the most inferior muscle of this group*
-
4 gluteal muscles
- gluteus minimis
- gluteus medius
- gluteus maximus
- tensor fasciae latae
-
gluteus minimis
origin
insertion
function
- origin- between the anterior and inferior gluteal lines of the ilium
- insertion- anterior and lateral surface of the greater trochanter of the femur
- function- abduction of the hip joint
- *deepest and smallest muscle of the group*
-
gluteus medius
origin
insertion
function
- origin- between the anterior and posterior gluteal lines
- insertion- lateral surface of the greater trochanter of the femur
- function- powerful abductor of the hip, anterior fibers rotate the hip medially
-
gluteus maximus
origin
insertion
function
- origin- from the rough ilium behind the posterior gluteal line, the posterior iliac crest, the lower posterior sacrum, and the side of the coccyx
- insertion- large upper teo thirds of the muscle attaches into the IT band of the fascia lata, lower third to the gluteal tuberosity
- function- extends the fexed thigh and lateral rotation of hip, abduction of the hip
-
tensor fasciae latae
origin
insertion
function
- origin- outer lip of the anterior iliac crest
- insertion- IT band
- function- medial rotation, flexion of the hip
-
-
psoas major
origin
insertion
function
- origin- transverse proccesses of the lumber vertebrae and lateral aspect of lumber vertebrae
- insertion- lesser trochanter of the femur
- function- powerful flexor of the hip, weak lateral rotator of hip, extends the lumber verterbral
-
iliacus
origin
insertion
function
- origin- superior half of the iliac fossa
- insertion- converges with the psoas major tendon to the lesser trochanter of femur
- function- powerful flexor of the hip, weak lateral rotator of the hip joint
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