Sunday, May 8, 2011

Muscle of lower limb

Table of Lower Limb Muscles
Muscles of Gluteal Region
Muscle
Origin
Insertion
Nerve
Action
gluteus maximus
outer surface of ilium, sacrum, coccyx, sacrotuberous ligament
iliotibial tract and gluteal tuberosity of femur
inferior gluteal nerve
extends & laterally rotates thigh; through iliotibial tract, it extends knee joint
gluteus medius
outer surface of ilium
greater trochanter of femur
superior gluteal nerve
abducts thigh. Tilts pelvis when walking
gluteus minimus
outer surface of ilium
greater trochanter of femur
superior gluteal nerve
abduct thigh; anterior fibers medially rotate thigh
tensor fasciae latae
iliac crest
iliotibial tract
superior gluteal nerve
assists gluteus major in locking the knee into full extension
piriformis
anterior surface of sacrum
greater trochanteric fossa
1st & 2nd sacral nerves
lateral rotator of thigh
superior gemellus
spine of ischium
greater trochanteric fossa
sacral plexus
lateral rotator of thigh
obturator internus
inner surface of obturator membrane
greater trochanteric fossa
sacral plexus
lateral rotator of thigh
inferior gemellus
ischial tuberosity
greater trochanteric fossa
sacral plexus
lateral rotator of thigh
obturator externus
outer surface of obturator membrane
greater trochanteric fossa of femur
obturator nerve
lateral rotator of thigh
Anterior Compartment of Thigh
sartorius
anterior superior iliac spine
upper medial surface of tibia
femoral nerve
flexes, abducts, laterally rotates thigh; flexes & medially rotates leg
iliacus
iliac fossa
with psoas into the lesser trochanter of femur
femoral nerve
flexes thigh on trunk; if thigh is fixed, it flexes the trunk onto the thigh as in sitting up
psoas
12th thoracic body; transverse process, bodies & intervertebral discs of the 5 lumbar vertebrae
lesser trochanter of femur along with iliacus
lumbar plexus
flexes thigh on trunk; if thigh fixed, it flexes trunk onto thigh as in sitting up
pectineus
superior ramus of pubis
upper end shaft of femur
femoral nerve
flexes and adducts thigh
quadriceps femoris, rectus femoris
straight head from anterior inferior iliac spine; reflected head from ilium above acetabulum
quadriceps tendon into patella; into tibial tuberosity by patellar tendon
femoral nerve
extension of leg
quadriceps femoris, vastus lateralis
upper end and shaft of femur
quadriceps tendon into patella; into tibial tuberosity by patellar tendon
femoral nerve
extension of leg
quadriceps femoris, vastus medialis
upper end and shaft of femur
quadriceps tendon into patella; into tibial tuberosity by patellar tendon
femoral nerve
extension of leg
quadriceps femoris, vastus intermedius
shaft of femur
quadriceps tendon into patella; into tibial tuberosity by patellar tendon
femoral nerve
extension of leg
Muscles of Medial Compartment of Thigh
gracilis
inferior ramus of pubis; ramus of ischium
upper part of shaft of tibia on medial surface
obturator nerve
adducts thigh and flexes leg
adductor longus
body of pubis
posterior surface of shaft of femur
obturator nerve
adducts thigh; assists in lateral rotation
adductor brevis
inferior ramus of pubis
posterior surface of shaft of femur
obturator nerve
adducts thigh; assists in lateral rotation
adductor magnus
inferior ramus of pubis; ramus of ischium, ischial tuberosity
posterior surface of shaft of femur near linea aspera; adductor tubercle of femur
obturator nerve; tibial nerve to hamstring part
adducts thigh and assists in lateral rotation; hamstring part extends thigh
Muscles of Posterior Compartment of Thigh
biceps femoris
long head from ischial tuberosity; short head from shaft of femur
head of fibula
long head:tibial; short head:common peroneal
flexes and laterally rotates leg; long head extends thigh
semitendinosus
ischial tuberosity
upper part medial surface of shaft of tibia
tibial nerve
flexes and medially rotates leg; extends thigh
semimembranosus
ischial tuberosity
medial condyle of tibia; forms oblique popliteal ligament
tibial nerve
flexes and medially rotates leg; extends thigh
adductor magnus (hamstring part)
ischial tuberosity
adductor tubercle of femur
tibial nerve
extends thigh
Muscles of Anterior Compartment of the Leg
tibialis anterior
shaft of tibia and interosseous membrane
medial cuneiform & base of first metatarsal
deep peroneal nerve
extends the foot; inverts foot at subtalar and transverse tarsal joints; supports medial longitudinal arch
extensor digitorum
shaft of fibula and interosseous membrane
extensor expansion of lateral four toes
deep peroneal nerve
extends toes; dorsiflexes (extends) foot
peroneus tertius
shaft of fibula & interosseous membrane
base of 5th metatarsal bone
deep peroneal nerve
dorsiflexes (extends) foot; everts foot at subtalar and transverse tarsal joints
extensor hallucis longus
shaft of fibula & interosseous membrane
base of distal phalanx of big toe
deep peroneal nerve
extends big toe; dorsiflexes (extends) foot; inverts foot at subtalar and transverse tarsal joints
Muscles of Lateral Compartment of Leg
peroneus longus
shaft of fibula
base of 1st metatarsal & medial cuneiform
superficial peroneal nerve
plantar flexes foot; everts foot at subtalar & transverse tarsal joints; supports lateral longitudinal and transverse arches of foot
peroneus brevis
shaft of fibula
base of 5th metatarsal bone
superficial peroneal nerve
plantar flexes foot; everts foot at subtalar & transverse tarsal joints; supports lateral longitudinal arch
Muscles of Posterior Compartment of the Leg
gastrocnemius
medial and lateral condyles of femur
by way of Achilles tendon to calcaneum
tibial nerve
plantar flexes foot; flexes leg
plantaris
lateral supracondylar ridge of femur
calcaneum
tibial nerve
plantar flexes foot; flexes leg
soleus
shafts of tibia and fibula
by way of achilles tendon into calcaneum
tibial nerve
with gastrocnemius & plantaris is powerful plantar flexor of foot; provides main propulsive force in walking & running
popliteus
lateral condyle of femur
shaft of tibia
tibial nerve
flexes leg; unlocks full extension of knee by laterally rotating femur on tibia
flexor digitorum longus
shaft of tibia
distal phalanges of lateral four toes
tibial nerve
flexes distal phalanges of lateral four toes; plantar flexes foot; supports medial and lateral longitudinal arches of foot
flexor hallucis longus
shaft of fibula
base of distal phalanx of big toe
tibial nerve
flexes distal phalanx of big toe; plantar flexes foot; supports medial longitudinal arch
tibialis posterior
shafts of tibia and fibula & interosseous membrane
tuberosity of navicular bone
tibial nerve
plantar flexes foot; inverts foot at subtalar and transverse tarsal joints; supports medial longitudinal arch of foot
Muscles on the Dorsum of Foot
extensor digitorum brevis
Calcaneum
by four tendons into the proximal phalanx of big toe and long extensor tendons to 2nd, 3rd and 4th toes
deep peroneal nerve
extends toes
Muscles of the Sole of the Foot (First Layer)
abductor hallucis
medial tubercle of calcaneum; flexor retinaculum
medial side, base of proximal phalanx of big toe
medial plantar nerve
flexes, abducts big toe; supports medial arch
flexor digitorum brevis
medial tubercle of calcaneum
middle phalanx of four lateral toes
medial plantar nerve
flexes lateral four toes; supports medial & lateral longitudinal arches
abductor digiti minimi
medial & lateral tubercles of calcaneum
lateral side base of proximal phalanx 5th toe
lateral plantar nerve
flexes, abducts 5th toe; supports lateral longitudinal arch
muscles of Sole of Foot (Second Layer)
flexor accessorius (quadratus plantae)
medial and lateral sides of calcaneum
tendons flexor digitorum longus
lateral plantar nerve
aids long flexor tendon to flex lateral four toes
flexor digitorum longus tendon
shaft of tibia
base of distal phalanx of lateral four toes
tibial nerve
flexes distal phalanges of lateral four toes; plantar flexes foot; supports longitudinal arch
lumbricals
tendons of flexor digitorum longus
dorsal extensor expansion of lateral four toes
1st lumbrical from medial plantar; remainder lumbricals from deep branch of lateral plantar nerve
extends toes at interphalangeal joints
flexor hallucis longus
shaft of fibula
base of distal phalanx of big toe
tibial nerve
flexes distal phalanx of big toe; plantar flexes foot; supports medial longitudinal arch
Muscles of Sole of Foot (Third Layer)
flexor hallucis brevis
cuboid, lateral cuneiform bones; tibialis posterior insertion
medial & lateral sides of base of proximal phalanx of big toe
medial plantar nerve
flexes metatarsophalangeal joint of big toe; supports medial longitudinal arch
adductor hallucis (oblique head)
bases of 2nd, 3rd & 4th metatarsal bones
lateral side base of proximal phalanx big toe
deep branch of lateral plantar
flexes big toe, supports transverse arch
adductor hallucis (transverse head)
plantar ligaments
lateral side of base of proximal phalanx big toe
deep branch of lateral plantar nerve
flexes big toe; supports transverse arch
flexor digiti minimi brevis
base of 5th metatarsal bone
lateral side of base of proximal phalanx of big toe
superior branch of lateral plantar nerve
flexes little toe
Muscles of Sole of Foot (Fourth Layer)
dorsal interossei (4)
adjacent sides of metatarsal bones
bases of phalanges and dorsal expansion of corresponding toes
lateral plantar nerve
abduct toes with 2nd toe as the reference; flex metatarsophalangeal joints; extend interphalangeal joint
plantar interossei (3)
3rd, 4th, and 5th metatarsal bones
bases of phalanges & dorsal expansion of corresponding toes
lateral plantar nerve
adduct toes with 2nd toe as reference; flex metatarsophalangeal joints; extend interphalangeal joints
tendon of peroneus longus
see above
see above
see above
see above
tendon of tibialis posterior
see above
see above
see above
see above



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