Lower Extremity OIA Flashcards
Psoas Major Origin
Anterior surfaces of TPs L1-L5 and both sides of bodies T12-S1
Psoas Major Insertion
Lesser Trochanter
Psoas Major Action
Hip FLX, lumbar FLX
Iliacus Origin
superior 2/3rds iliac fossa, ala of sacrum, and anterior sacroiliac legs
Iliacus Insertion
lesser trochanter and femur shaft just distal to lesser trochanter, tendon fused with psoas major tendon
Iliacus Action
Hip FLX and trunk FLX, stabilizes the hip
Gluteus Maximus Origin
Ilium posterior gluteal, iliac crest, lateral surface of ilium, sacrum, coccyx, sacrotuberous ligament, and thoracolumbar fascia
Gluteus Maximus Insertion
Iliotibial tract and gluteal tuberosity of femur
Gluteus Maximus Action
Hip EXT, assists in ER, assists in raising trunk from flexed position, powerful ER when hip extended
Gluteus Medius Origin
anterior iliac crest, lateral surface of ilium btw posterior and anterior gluteal lines
Gluteus Medius Insertion
greater trochanter of femur
Gluteus Medius Action
hip ABD and IR
Gluteus Minimus Origin
lateral ilium btw inferior and anterior gluteal lines
Gluteus Minimus Insertion
greater trochanter of the femur
Gluteus Minimus Action
hip ABD & IR, keeps pelvis level when ipsilateral hip is WB
TFL Origin
anterior parts of iliac crests, just posterior to ASIS
TFL Insertion
descends vertically downwards to be inserted into the ITB
TFL Action
hip FLX (acts in concert with Iliopsoas and Rectus Femoris), ABD and IR of the hip
ITB Origin
tubercle of the iliac crest
ITB Insertion
lateral condyle of tibia (Gerdy’s Tubercle)
Piriformis Origin
anterior sacrum
Piriformis Insertion
greater trochanter
Piriformis Action
ER, ABD of flexed hip
Gemelli Superior Origin
Ischial spine
Gemelli Superior Insertion
trochanteric fossa
Gemelli Superior Action
ER, ABD of flexed hip
Gemelli Inferior Origin
ischial tuberosity
Gemelli Inferior Insertion
trochanteric fossa
Gemelli Inferior Action
ER, ABD of flexed hip
Quadratus Femoris Origin
ischial tuberosity
Quadratus Femoris Insertion
quadrate tubercle on Intertrochanteric Crest of femur
Quadratus Femoris Action
hip ER
Obturator Internus Origin
medial margins of obturator foramen
Obturator Internus Insertion
trochanteric fossa
Obturator Internus Action
hip ER, ABD of flexed hip
Obturator Externus Origin
lateral margins of obturator foramen
Obturator Externus Insertion
trochanteric fossa
Obturator Externus Action
hip ER
Sartorius Origin
ASIS
Sartorius Insertion
medial tibia near tibial tuberosity
Sartorius Action
Hip: ABD, ER, FLX
Knee: FLX
medially rotates the lower leg when knee is flexed
Rectus Femoris Origin
AIIS
Rectus Femoris, Vastus Intermedius, Vastus Lateralis, Vastus Medialis Insertion
tibial tuberosity via quadriceps tendon, patella, and patellar ligament
Rectus Femoris, Vastus Intermedius, Vastus Lateralis, Vastus Medialis Action
EXT of the knee