Quiz 6: Lower Extremity Flashcards
tensor fasciae latae origin
anterior superior iliac spine
tensor faciae latae insertion
iliotibial tract
tensor fascia latae action
tenses fascia lata
hip joint: abduction, flexion, internal rotation
piriformis origin
pelvic surface of sacrum
piriformis insertion
greater trochanter of femur
piriformis action
External rotation, abduction, and extension of the hip joint
Stabilizes the hip joint
obturator internus origin
Inner surface of the obturator membrane and its bony boundaries
obturator internus insertion
medial surface of greater trochanter
obturator internus action
External rotation, adduction, and extension of the hip joint (also active in abduction, depending on the joint’s position)
gemelli superior origin
ischial spine
gemelli inferior origin
ischial tuberosity
gemelli (superior/inferior) insertion
jointly with obturator internus tendon (medial surface, greater trochanter)
Gemelli (superior and inferior) action
External rotation, adduction, and extension of the hip joint (also active in abduction, depending on the joint’s position)
quadratus femoris origin
lateral border of ischial tuberosity
quadratus femoris insertion
intertrochanteric crest of femur
quadratus femoris action
hip: external rotation and adduction
sartorius origin
anterior superior iliac spine
sartorius insertion
Medial to the tibial tuberosity (together with gracilis and semitendinosus)
sartorius action
hip: flexion, abduction, external rotation
knee: flexion, internal rotation
rectus femoris origin
anterior inferior iliac spine, acetabular roof of hip joint
rectus femoris insertion
tibial tuberosity via patellar ligament
rectus femoris action
hip: flexion
knee: extension
vastus medialis origin
linea aspera and intertrochanteric line
vastus medialis insertion
both sides of tuberosity on medial and lateral epicondyles via medial and longitudinal patellar retinacula
vastus medialis action
extends knee
vastus lateralis origin
linea aspera and greater trochanter
vastus lateralis insertion
both sides of tuberosity on medial and lateral epicondyles via medial and longitudinal patellar retinacula
vastus lateralis action
extends knee
vastus intermedius origin
Femoral shaft (anterior side)
vastus intermedius insertion
tibial tuberosity via patellar ligament
vastus intermedius action
extends knee
articularis genus origin
anterior side of femoral shaft at level of the suprapatellar recess
articularis genus insertion
suprapatellar recess of knee joint capsule
articularis genus action
knee: extension
retracts suprapatellar bursa to prevent entrapment of capsule
pectineus origin
pecten pubis
pectineus insertion
pectineal line of femur and proximal linea aspera
pectineus action
hip: adduction, external rotation, slight flexion
stabilizes pelvis in coronal and sagittal plane
adductor longus origin
Superior pubic ramus and anterior side of the pubic symphysis
adductor longus insertion
Femur (linea aspera, medial lip in the middle third of the femur)
adductor longus action
hip: adduction, flexion (up to 70 degrees), extension (past 80 degrees of flexion)
stabilizes pelvis in coronal and sagittal plane
adductor brevis origin
inferior ramus of pubis
adductor brevis insertion
Femur (linea aspera, medial lip in the middle third of the femur)
adductor brevis action
hip: adduction, flexion (up to 70 degrees), extension (past 80 degrees of flexion)
stabilizes pelvis in coronal and sagittal plane
gracilis origin
inferior ramus of pubis below symphysis
gracilis insertion
Tibia (medial border of the tuberosity, along with the tendons of sartorius and semitendinosus)
gracilis action
hip: adduction, flexion
knee: flexion and internal rotation
obturator externus origin
Outer surface of the obturator membrane and its bony boundaries
obturator externus insertion
trochanteric fossa of femur
obturator externus action
hip: adduction, external rotation
stabilizes pelvis in sagittal plane
adductor magnus origin
ischial and pubic rami and ischial tuberosity
adductor magnus (deep) insertion
medial lip of linea aspera
adductor magnus (superficial) insertion
adductor tubercle of femur
adductor magnus action
hip: adduction, extension, slight flexion (superficial does internal rotation)
stabilized pelvis in coronal and sagittal planes
biceps femoris long head origin
ischial tuberosity and sacrotuberous ligament
biceps femoris short head origin
lateral lip of linea aspera in middle third of femur
biceps femoris insertion
head of fibula
biceps femoris long head action
hip: extention, stabilizes pelvis in sagittal plane
knee: flexion, external rotation
biceps femoris short head action
knee: flexion, external rotation
semimembranosus origin
ischial tuberosity
semimembranosus insertion
Medial tibial condyle, oblique popliteal ligament, popliteus fascia
semimembranosus action
hip: extension, stabilizes pelvis in sagittal plane
knee: flexion, internal rotation
semitendinosus origin
ischial tuberosity and sacrotuberous ligament
semitendinosus insertion
medial to tibial tuberosity in the pes anserinus (along with tendons of gracilis and sartorius)
semitendiosus action
hip: extension, stabilizes pelvis in sagittal plane
knee: flexion, internal rotation
tibialis anterior origin
tibia, interosseous membrane, superficial crural fascia
tibialis anterior insertion
medial cuneiform and 1st metatarsal
tibialis anterior action
talocrural joint: dorsiflexion
subtalar joint: inversion (supination)
extensor hallucis longus origin
fibula and interosseous membrane
extensor hallucis longus insertion
1st toe (at the dorsal aponeurosis and the base of its distal phalanx)
extensor hallucis longus action
talocrural joint: dorsiflexion
subtalar joint: active in both eversion and inversion (pronation/supination)
depending on initial position of foot extends the MTP and IP joints of big toe
extensor digitorum longus origin
Fibula (head and medial surface), tibia (lateral condyle), and interosseous membrane
extensor digitorum longus insertion
2nd to 5th toes (at the dorsal aponeuroses at the bases of the distal phalanges)
extensor digitorum longus action
talocrural: dorsiflexion
subtalar: eversion (pronation)
extends MTP and IP joints of 2nd-5th toes
fibularis tertius origin
distal fibula
fibularis tertius insertion
base of 5th metatarsal
fibularis tertius action
talocrural joint: dorsiflexion
subtalar joint: eversion (pronation)
fibularis longus origin
Fibula (head and proximal two thirds of the lateral surface, arising partly from the intermuscular septa)
fibularis longus insertion
medial cuneiform and 1st metatarsal
fibularis longus action
Talocrural joint: plantar flexion
Subtalar joint: eversion (pronation)
Supports the transverse arch of the foot
fibularis brevis origin
Fibula (distal half of the lateral surface), intermuscular septa
fibularis brevis insertion
5th metatarsal (tuberosity at the base, with an occasional division to the dorsal aponeurosis of the 5th toe)
fibularis brevis action
talocrural joint: plantar flexion
subtalar joint: eversion (pronation)
gastrocnemius origin
femur (medial head: above the medial femoral condyle; lateral head: lateral surfaceof femoral condyle)
gastrocnemius insertion
calcaneal tuberosity via calcaneal (achilles) tendon
gastronemius action
talocrual: plantar flexion when knee extended
knee: flexion
soleus origin
tibia and fibula
soleus insertion
calcaneal tuberosity via calcaneal (achilles) tendon
soleus action
Talocrural joint: plantar flexion
plantaris origin
Femur (lateral epicondyle, proximal to lateral head of gastrocnemius)
plantaris insertion
calcaneal tuberosity via calcaneal (achilles) tendon
plantaris action
negligible; may act with gastrocnemius in plantar flexion
tibialis posterior origin
interosseous membrane, adjacent borders of tibia and fibula
tibialis posterior insertion
navicular, cuneiforms, and metatarsals 2-4
tibialis posterior action
Talocrural joint: plantar flexion
Subtalar joint: inversion (supination)
Supports the longitudinal and transverse arches
tibialis posterior action
Talocrural joint: plantar flexion
Subtalar joint: inversion (supination)
Supports the longitudinal and transverse arches
flexor digitorum longus origin
Tibia (middle third of posterior surface)
flexor digitorum longus insertion
bases of distal phalanges of toes 2-5
flexor digitorum longus action
talocrural joint: plantar flexion
subtalar joint: inversion (supination)
MTP and IP joints of the 2nd to 5th toes: plantar flexion
flexor hallucis longus origin
Fibula (distal 2/3 of posterior surface), adjacent interosseous membrane
flexor hallucis longus insertion
1st distal phalanx (base)
flexor hallucis longus action
talocrural joint: plantar flexion
subtalar joint: inversion (supination)
MTP and IP joints of the 1st toe: plantar flexion
supports the medial longitudinal arch
popliteus origin
Lateral femoral condyle, posterior horn of the lateral meniscus
popliteus insertion
Posterior tibial surface (above the origin at the soleus)
popliteus action
knee: flexes and unlocks the knee by externally rotating femur on fixed tibia 5 degrees
extensor digitorum brevis origin
dorsal surface of calcaneus
extensor digitorum brevis insertion
2nd to 4th toes (at dorsal aponeuroses and bases of middle phalanges)
extensor digitorum brevis action
extension of MTP and PIP joints. of 2nd-4th toes
extensor hallucis brevis origin
dorsal surface of calcaneus
extensor hallucis brevis insertion
1st toe (at dorsal aponeurosis and proximal phalanx)
extensor hallucis brevis action
Extension of the MTP joints of the 1st toe
abductor hallucis origin
Calcaneal tuberosity, flexor retinaculum, plantar aponeurosis
abductor hallucis insertion
1st toe (base of proximal phalanx via the medial sesamoid)
abductor hallucis action
1st MTP joint: flexion and abduction of the 1st toe
Supports the longitudinal arch
flexor digitorum brevis origin
Calcaneal tuberosity and plantar aponeurosis
flexor digitorum brevis insertion
2nd to 5th toes (sides of middle phalanges)
flexor digitorum brevis action
Flexes the MTP and PIP joints of the 2nd to 5th toes, supports the longitudinal arch
abductor digiti minimi origin
Calcaneal tuberosity and plantar aponeurosis
abductor digiti minimi insertion
5th toe (base of proximal phalanx), 5th metatarsal (at tuberosity)
abductor digiti minimi action
flexes the MTP joint of the 5th toe
abducts the 5th toe
supports the longitudinal arch
quadratus plantae origin
Calcaneal tuberosity (medial and plantar borders on plantar side)
quadratus plantae insertion
Flexor digitorum longus tendon (lateral border)
quadratus plantae action
Redirects and augments the pull of flexor digitorum longus
Lumbricals (4 muscles) origin
tendons of flexor digitorum profundus
lumbricals (4 muscles) insertion
2nd-5th toes (at dorsal aponeuroses)
Lumbricals (4 muscles) action
flexes MTP joint of 2nd-5th toes
extension of IP joints of 2nd-5th toes
adducts 2nd-5th toes towards big toe
flexor hallucis brevis origin
- Cuboid
- Lateral Cuneiform
- Plantar Calcaneocuboid Ligament
flexor hallucis brevis insertion
1st toe (at base of proximal phalanx via medial and lateral sesamoids)
flexor hallucis brevis action
flexes the 1st MTP joint
supports the longitudinal arch
adductor hallucis (oblique head) origin
2nd-4th metatarsals, cuboid, lateral cuneiforms
adductor hallucis (transverse head) origin
MTPs of 3rd-5th toes, deep transverse metatarsal ligament
adductor hallucis insertion
1st proximal phalanx (at base, by a common tendon via the lateral sesamoid)
adductor hallucis action
flexes 1st MTP joint
transverse: supports transverse arch
oblique: supports longitudinal arch
flexor digit minimi brevis origin
base of 5th metatarsal, long plantar ligament
flexor digiti minimi brevis insertion
5th toe (base of proximal phalanx)
flexor digiti minimi brevis action
Flexes MTP joint of little toe
opponens digiti minimi origin
long plantar ligament; fibularis longus (at plantar tendon sheath)
opponens digiti minimi insertion
5th metatarsal
opponens digiti minimi action
pulls 5th metatarsal in plantar and medial direction
plantar interossei (3 muscles) origin
3rd-5th metatarsals
plantar interossei (3 muscles) insertion
3rd to 5th toes (medial base of proximal phalanx)
plantar interossei (3 muscles) action
flexes MTP joint of 3rd-5th toes
extension of IP joint of 3rd-5th toes
adducts 3rd-5th toes toward 2nd toe
dorsal interossei (4 muscles) origin
1st-5th metatarsals (by two heads on opposing sides)
dorsal interossei (4 muscles) insertion
1st interosseus: 2nd proximal phalanx
2nd-4th interossei: 2nd-4th proximal phalanges and toes
dorsal interossei (4 muscles) action
flexes MTP joint of 2nd-5th toes
extension of IP joint of 2nd-5th toes
abducts 3rd-4th toes from 2nd toe