Lower Extremity Flashcards
Obturator internus
O: obturator membrane
I: medial side of greater trochanter
Inv: nerve to obturator internus
F: externally rotates extended femur and abducts flexed femur
piriformis
O: anterior surface of sacrum
I: medial side of superior border of greater trochanter
Inv: branches of L5, S1, S2
F: externally rotates extended femur and abducts flexed femur
Gemellus superior
O: external surface of ischial spine
I: medial side of greater trochanter
Inv: nerve to obturator internus
F: externally rotates the extended femur and abducts the flexed femur
Gemellus inferior
O: upper aspect of ischial tuberosity
I: medial side of greater trochanter
Inv: nerve to quadratus femoris
F: externally rotates the extended femur and abducts the flexed femur
Quadratus femoris
O: ischial tuberosity
I: quadrate tubercle
Inv: nerve to quadratus femoris
F: externally rotates femur at hip joint
Gluteus minimus
O: ilium between inferior and anterior gluteal lines
I: greater trochanter
Inv: superior gluteal nerve
F: abducts the femur at the hip jt
holds pelvis secure over stance leg
prevents pelvic drop on opposite swing side during walking
internally rotates thigh
Gluteus medius
O: ilium between anterior and posterior gluteal lines
I: greater trochanter
Inv: superior gluteal nerve
F: abducts the femur at the hip jt
holds pelvis secure over stance leg
prevents pelvic drop on opposite swing side during walking
internally rotates thigh
Gluteus maximus
O: ilium behind posterior gluteal line I: IT band, gluteal tuberosity Inv: inferior gluteal nerve F: extensor of flexed femur at hip lateral stabilizer of hip joint and knee joint external rotates and abducts thigh
Tensor fascia lata
O: ilium between ASIS and tubercle of the crest
I: IT band
Inv: superior gluteal nerve
F: stabilize the knee in extension
Psoas major
O: lumbar transverse process from T12-L5
I: lesser trochanter
Inv: Anterior Rami L1, L2, L3 (nerve to psoas major)
F: Flexes the hip
Iliacus
O: posterior abdominal wall
I: lesser trochanter
Inv: femoral nerve
F: flexes the hip
Vastus medialis
O: medial lip of the linea aspera, medial supracondylar line
I: quadriceps tendon
Inv: femoral nerve
F: extends the knee
Vastus intermedius
O: upper 2/3 of anterior and lateral surfaces of the femur
I: quadriceps tendon
Inv: femoral nerve
F: extends the knee
Vastus lateralis
O: lateral lip of the linea aspera, intertrochanteric line
I: quadriceps tendon
Inv: femoral nerve
F: extends the knee
Rectus femoris
O: Straight head: AIIS Reflected head: ilium just superior to acetabulum I: quadriceps tendon Inv: femoral nerve F: flexes the hip and extends the knee
Sartorius
O: ASIS
I: medial surface of the tibia
Inv: femoral nerve
F: flexes the hip, flexes the knee, externally rotates thigh
Gracilis
O: external surface of the body of the pubis, inferior pubic ramus, and ramus of the ischium
I: medial surface of the proximal shaft of the tibia
Inv: obturator nerve
F: Adducts hip and flexes knee
Pectineus
O: pectineal line and adjacent bone of pelvis
I: linea aspera on posterior surface of proximal femur
Inv: femoral nerve
F: Adducts and flexes hip
Adductor longus
O: external surface of the body of the pubis
I: linea aspera on the middle 1/3 shaft of the femur
Inv: obturator nerve
F: Adducts and internally rotates thigh at hip joint
Adductor brevis
O: external surface of the body of the pubis, inferior pubic ramus
I: posterior surface of proximal 1/3 of linea aspera
Inv: obturator nerve
F: adducts thigh at hip joint
Adductor Magnus
O: Adductor part: ischiopubic ramus
Hamstring part: ischial tuberosity
I: Adductor part: linea aspera, medial supracondylar line
Hamstring part: adductor tubercle and supracondylar line
Inv: Adductor part: obturator nerve
Hamstring part: sciatic nerve
F: Adducts and Internally rotates thigh at hip joint
Obturator externus
O: external surface of obturator membrane and adjacent bone
I: trochanteric fossa
Inv: obturator nerve
F: externally rotates the thigh at the hip joint
Biceps femoris
O: long head: ischial tuberosity short head: lateral lip of linea aspera I: head of fibula; lateral condyle of tibia Inv: sciatic nerve F: flexes and ER leg at knee joint extends and ER thigh at hip joint
Semitendonosis
O: ischial tuberosity I: medial surface of proximal tibia Inv: sciatic nerve F: flexes and IR knee extends and IR hip