gluteal and posterior femoral muscles Flashcards
Gluteus Maximus
O- posterior crest of illium, posterior gluteal line, sacrotuberous ligament
I- gluteal tuberosity and Iliotibial tract
A- extend and laterally rotates thigh; act on ITT with tensor fascia latae to stabilize knee (important for stair and getting up from seated position)
N- inferior gluteal nerve
Gluteus Medius
O- illium, posterior and anterior gluteal lines
I- greater trochanter
A- abduction; posterior fibers- act with maximus to laterally rotate; anterior fibers acts with minims to medially rotates, level sacral base when opposite limb is unsupported
N- superior gluteal nerve
Gluteus Minimus
O- illium btw anterior and inferior gluteal lines
I- greater trochanter
A- abduction, and medially rotates thigh, acts with medius to level sacral base
N- superior gluteal nerve
Tensor Fascia Latae
O- Nest to ASIS
I- lateral tibial condyle via illiotibial tract
A- abducts, flexes, and medially rotates thigh; maintains knee in extended position by tensing illiotibial tract
N- superior gluteal nerve
Superficial gluteal muscles
- gluteus maximus
- gluteus medius
- gluteus minimux
- tensor fascia latae
deep gluteal muscles
- piriformis
- gemellus superior
- obturator internus
- gemellus inferior
- quadratus femoris
piriformis
O- anterior surface of sacrum
I- greater trochanter
A- abduction and lateral rotation of thigh
N- nerve to piriformis
Gemellus Superior
O- ischial spine
I- tendon of obturator interns
A- lateral rotation of thigh
N- nerve to obturator internus
Obturator internus
O- margin of obturator foramen
I- greater trochanter
A- lateral rotation and some abduction
N- nerve to quadrator internus
Gemellus Inferior
O- ischial tuberosity near margin of sciatic notch
I- tendon of obturator interns
A- lateral rotation of thigh
N- nerve to quadratus femoris
Quadratus Femoris
O- ischial tuberostiy
I- quadrate line btw trochanters
A- lateral rotation of thigh
N- nerve to quadratus femoris
posterior femoral compartment muscles
- biceps femoris
- semimembranous
- semitendenous
Biceps Femoris
O- long head: ischial tuberosity
Short head: lateral lip of linea aspera
I- lateral condyle of tibia and head of fibula
A- long head- extends thigh, flexes leg; short head- flexes leg
N- long head- tibial component of sciatic nerve; short head- common fibular nerve
Semimembranosus
O- ischial tuberosity
I- posterior surface, medial condyle of tibia
A- extends thigh, flexes and medially rotates leg when knee is flexed
N- tibial component of sciatic nerve
semitendinosus
O- ischial tuberosity
I- medial anterior surface of tibia below condyle
A- extends thigh; flexes and medially rotates leg when knee is flexed
N- tibial compartment of sciatic nerve
