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22 terms

A: Muscles of the lower leg

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P: T12-L5 vertebrae and discs; transverse process of all lumbar vertebrae
D: lesser trochanter, pectineal line, iliopectineal eminence via iliopectineal arch
N: ventral rami of lumbar nerves (L1, L2, L3 & Femoral N (L2, L3)
A: flex thigh at hip, also can influence on posture of pelvis in weight bearing; may be some stability in pelvis but no direct influence on hip motion
iliopsoas (iliacus + psoas)
P: ASIS and anterior part of iliac crest
D: iliotibial tract that attaches to lateral tibial condyle
N: superior gluteal N (L4 and L5)
A: ABducts, medially (internally) rotates and flexes thigh; helps to keep knee extended; steadies trunk on thigh
tensor fascia latae
P: ASIS and superior part of notch inferior to it
D: superior part of medial surface of tibia (superior to inferior) Say (sartorius) Grace (gracilis) before Tea (semitendinousis))
N: femoral N (L2 & L3)
A: flexes, aBducts, and laterally (externally) rotates thigh at hip; flexes leg at knee joint. (flex, ABducts, ER)
sartorius
P: AIIS and ilium superior to acetabulum
D: Base of patella and by ligament to tibial tuberosity
N: Femoral (L2, L3 & L4)
A: extends knee joint; also slightly flexes the hip
Pathology: *AIIS is only little bone- Classic Avulsion Fracture here
rectus femoris (quadriceps femoris = rectus femoris + vastus lateralis, medialis & intermedius) (**rectus femoris is the only muscle involved in hip flexion that crosses the hip joint)
P: greater trochanter and lateral lip of linea aspera of femur
D: base of patella and by ligament to tibial tuberosity
N: femoral (L2, L3 and L4)
A: extends knee joint
vastus lateralis (quadriceps femoris = rectus femoris + vastus lateralis, medialis & intermedius)
P: intertrochanteric line and medial lip of linea aspera of femur
D: Base of patella and by ligament to tibial tuberosity
N: femoral (L2, L3 and L4)
A: extends knee joint
Obliquus (VMO) distal fibers which primarily help to prevent patella to track laterally
vastus medialis
P: anterior and lateral surfaces of body of femur
D: base of patella and by ligament to tibail tuberosity
N: femoral (L2, L3 & L4)
A: extends knee joint
vastus intermedius
*innervated by femoral NOT obturator
*careful not to confuse this muscle with obturator externus muscle- often confused (view skeleton for clarity)
P: superior ramus of pubis
D: pectineal line of femur, just inferior to lesser trochanter
N: femoral N (L2 & L3; may receive branch from obturator N)
A: adducts and flexes thigh; assists with medial rotation
Pectineus
*most superior, adductor brevis is behind it
P: body of pubis inferior to pubic crest
D: middle 1/3 of linear aspera of femur
N: obturator n. brance of ant division (L2, L3, and L4)
A: adducts thigh
aductor longus (superficial to adductor brevis)
2 joint muscle (attaches to inferior pubic ramus as does gracilis- rope muscle)
P: body and inferior ramus of pubis
D: pectineal line & proximal part of linea aspera of femur
N: obturator n (L2, L3, L4) branch of ant division
A: adducts thigh and some flexion as well
adductor brevis (brevis deep to longus
Distal attachment forms arch known as ADDUCTOR HIATUS (femoral arter & vein pass posterior through hiatus)
P: adductor part: inferior ramus of ischium; hamstring part; ischial tuberosity
D: adductor part: gluteal tuberosity, linea aspera, medial supracondylar line; hamstrings part; adductor tubercle of femur
N: adductor part: obturator N (L2, L3, and L4) branches of posterior division; hamstring part; tibial part of sciatic nerve (L4)
A: adducts thigh;
adductor part: flexes thigh, hamstrings part extends thigh
adductor magnus (people mistakenly grab this muscle and think they are grabbing the hamstring)
P: body of inferior ramus of pubis
D: superior part of medial surface of tibia
N: obturator N (L2 & L3)
A: adducts thigh, flexes leg, and helps to rotate leg medially
gracilis
P: margins of obtruator foramen and obturator membrane
D: trochanteric fossa of femur
N: obturator n (L3&L4)
A: lateraly rotates thigh; steadies head of femur in acetabulum
obturator externus
P: illium posterior to posterior gluteal line, dorsal surface of sacrum and coccyx and sacrotuberous ligament
D: Most fibers end in iliotibial tract that inserts into lateral condyle of tibia; some fibers insert on gluteal tuberosity of femur
N: inferior gluteal nerve (L5, S1, S2)
A: extends thigh (especially from flexed postion) and assists in its lateral rotation; steadies thigh and assists in rising from sitting position (also helps stabilize knee due to its attachment onto the iliotibial tract which crosses the knee joint.
gluteus maximus (blends into TFL connective tissue, critical role in ITfunction)
P: external surface of the ilium between anterior and posterior gluteal lines
D: lateral surface of greater trochanter of femur
N: superior gluteal nerve (L5, S1)
A: aBducts and medially rotates thigh; keeps pelvis level when opposite leg is raised
gluteus medius
keeps you from tipping over sideways
'P: external surface of ilium between anterior surface of ilium between anterior and inferior gluteal lines
D: anterior surface of greater trochanter of femur
N: superior gluteal nerve (L5, S1)
A: aBducts and medially rotates thigh; keeps pelvis level when opposite leg is raised
gluteus minimus
P: anterior surface of the sacrum and sacrotuberous ligament
D: superior border of greater trochanter
N: branches of ventral rami of S1, S2
A: laterally rotates extended thigh and abducts flexed thigh: steady femoral head in acetabulum
piriformis (inferior glut nerve sneaks out below piriformis)
P: pelvic surface of obturator membrane and surrounding ones
D: medial surface of greater trochanter (trochanteric fossa of femur)
N: n. to obturator internus (L5, S1)
A: laterally rotates extended thigh and aBducts flexed thigh; steady femoral head in acetabulum
obturator internus
P: superior- ischial spine; inferior- ischial tuberosity
D: gemellus muscle blends with obturator internus tendon as it attaches to greater trochanter of femur
N: nerve to obturator internus (L5, S1)
A: laterally rotates extended thigh and aBducts flexed thigh; steady femoral head in acetabulum
superior gemellus
P: superior- ischial spine; inferior- ischial tuberosity
D: gemellus muscle blends with obturator internus tendon as it attaches to greater trochanter of femur
N: same nerve as quadratus femoris(L5, S1)
A: laterally rotates extended thigh and aBducts flexed thigh; steady femoral head in acetabulum
inferior gemellus
P: lateral border of ichial tuberosity
D: gamellus muscle blends with obturator internus tendon as it attaches to greater trochanter of femur
N: same nerve as quadratus femoris (L5, S1)
A: laterally rotates extended thigh and aBducts flexed thigh; steady femoral head in acetabulum
quadratus femoris
P: margins of obturator foramen and obturator membrane
D: trochanteric fossa of femur
N: obturator nerve (L3, L4)
A: laterally rotates extended thigh and aBducts flexed thigh; steady femoral head in acetabulum
obturator externus